testing: rollback changes to ParticipationExpirationTest

[tsachiherman]

Summary

The state proof branch contained a change to testExpirationAccounts, changing the partKeyValidityPeriod from 10 to 150. This increase the duration of the test substantially, and (apparently) also causing the test to fail.

This PR rolls back that change.

Test Plan

This is a test.

[codecov-commenter]

Codecov Report

Merging #3611 (3b71974) into master (71e39cd) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3611      +/-   ##
==========================================
+ Coverage   48.06%   48.07%   +0.01%     
==========================================
  Files         381      381              
  Lines       62074    62074              
==========================================
+ Hits        29836    29844       +8     
+ Misses      28817    28804      -13     
- Partials     3421     3426       +5     

Impacted Files	Coverage Δ
cmd/algoh/blockWatcher.go	77.77% <0.00%> (-3.18%)	⬇️
crypto/merkletrie/trie.go	66.42% <0.00%> (-2.19%)	⬇️
crypto/merkletrie/node.go	91.62% <0.00%> (-1.87%)	⬇️
network/requestTracker.go	70.68% <0.00%> (-0.44%)	⬇️
network/wsNetwork.go	62.79% <0.00%> (-0.20%)	⬇️
catchup/service.go	69.38% <0.00%> (ø)
network/wsPeer.go	68.61% <0.00%> (+0.55%)	⬆️
data/transactions/verify/txn.go	45.02% <0.00%> (+0.86%)	⬆️
data/abi/abi_type.go	88.62% <0.00%> (+0.94%)	⬆️
catchup/peerSelector.go	100.00% <0.00%> (+1.04%)	⬆️
... and 1 more

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