Query rooms with ACLs instead of all rooms

[S7evinK]

This now should actually speed up startup times.
This is because many rooms (like DMs) don't have room ACLs, this means that we had around 95% pointless DB queries. (as queried on d.m.org)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 67.45%. Comparing base (09f15a3) to head (b9011f7).

❗ Current head b9011f7 differs from pull request most recent head aece4c3. Consider uploading reports for the commit aece4c3 to get more accurate results

Files	Patch %	Lines
roomserver/storage/shared/storage.go	45.45%	3 Missing and 3 partials ⚠️
roomserver/storage/postgres/events_table.go	71.42%	2 Missing and 2 partials ⚠️
roomserver/storage/sqlite3/events_table.go	71.42%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3338      +/-   ##
==========================================
+ Coverage   67.39%   67.45%   +0.05%     
==========================================
  Files         518      518              
  Lines       46887    46898      +11     
==========================================
+ Hits        31598    31633      +35     
+ Misses      11343    11324      -19     
+ Partials     3946     3941       -5     

Flag	Coverage Δ
unittests	52.62% <66.66%> (+0.07%)	⬆️

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