Fix passing the off_heap flag in the right place

[NelsonVides]

This one I detected it with the new eqwalizer tool, the flag as given in the current place is ignored.

[codecov]

Codecov Report

Merging #3727 (5cad292) into master (5a18d5a) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3727      +/-   ##
==========================================
- Coverage   82.28%   82.24%   -0.04%     
==========================================
  Files         526      526              
  Lines       33853    33853              
==========================================
- Hits        27856    27844      -12     
- Misses       5997     6009      +12     

Impacted Files	Coverage Δ
src/async_pools/mongoose_async_pools.erl	91.66% <ø> (ø)
src/ejabberd.erl	55.00% <0.00%> (-5.00%)	⬇️
src/cassandra/mongoose_cassandra.erl	77.77% <0.00%> (-3.71%)	⬇️
src/cassandra/mongoose_cassandra_worker.erl	66.03% <0.00%> (-2.84%)	⬇️
...bal_distrib/mod_global_distrib_hosts_refresher.erl	66.66% <0.00%> (-2.23%)	⬇️
src/mod_muc_room.erl	78.39% <0.00%> (-0.29%)	⬇️
src/pubsub/node_pep.erl	79.62% <0.00%> (ø)
src/pubsub/mod_pubsub.erl	73.42% <0.00%> (+0.06%)	⬆️
src/ejabberd_sm.erl	84.91% <0.00%> (+0.32%)	⬆️

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[mongoose-im]

small_tests_24 / small_tests / 5cad292
Reports root / small

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small_tests_25 / small_tests / 5cad292
Reports root / small

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ldap_mnesia_24 / ldap_mnesia / 5cad292
Reports root/ big
OK: 1897 / Failed: 0 / User-skipped: 513 / Auto-skipped: 0

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dynamic_domains_pgsql_mnesia_25 / pgsql_mnesia / 5cad292
Reports root/ big
OK: 3340 / Failed: 0 / User-skipped: 88 / Auto-skipped: 0

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dynamic_domains_pgsql_mnesia_24 / pgsql_mnesia / 5cad292
Reports root/ big
OK: 3340 / Failed: 0 / User-skipped: 88 / Auto-skipped: 0

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ldap_mnesia_25 / ldap_mnesia / 5cad292
Reports root/ big
OK: 1897 / Failed: 0 / User-skipped: 513 / Auto-skipped: 0

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internal_mnesia_25 / internal_mnesia / 5cad292
Reports root/ big
OK: 2018 / Failed: 0 / User-skipped: 392 / Auto-skipped: 0

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dynamic_domains_mysql_redis_25 / mysql_redis / 5cad292
Reports root/ big
OK: 3323 / Failed: 0 / User-skipped: 105 / Auto-skipped: 0

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dynamic_domains_mssql_mnesia_25 / odbc_mssql_mnesia / 5cad292
Reports root/ big
OK: 3340 / Failed: 0 / User-skipped: 88 / Auto-skipped: 0

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elasticsearch_and_cassandra_25 / elasticsearch_and_cassandra_mnesia / 5cad292
Reports root/ big
OK: 2314 / Failed: 0 / User-skipped: 387 / Auto-skipped: 0

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pgsql_mnesia_25 / pgsql_mnesia / 5cad292
Reports root/ big
OK: 3714 / Failed: 0 / User-skipped: 97 / Auto-skipped: 0

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riak_mnesia_24 / riak_mnesia / 5cad292
Reports root/ big
OK: 2175 / Failed: 0 / User-skipped: 380 / Auto-skipped: 0

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pgsql_mnesia_24 / pgsql_mnesia / 5cad292
Reports root/ big
OK: 3714 / Failed: 0 / User-skipped: 97 / Auto-skipped: 0

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mssql_mnesia_25 / odbc_mssql_mnesia / 5cad292
Reports root/ big
OK: 3714 / Failed: 0 / User-skipped: 97 / Auto-skipped: 0

---

mysql_redis_25 / mysql_redis / 5cad292
Reports root/ big
OK: 3709 / Failed: 0 / User-skipped: 102 / Auto-skipped: 0

[chrzaszcz]

Looks good 👍