Revert "perf(subscriptions): Increase load factor to 3 for subscripti…

[lynnagara]

…ons load test (#2271)"

This reverts commit 6146063.

Scheduler can't keep up with load_factor = 3, revert back to 2

[codecov-commenter]

Codecov Report

Merging #2286 (546244b) into master (6146063) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2286   +/-   ##
=======================================
  Coverage   93.06%   93.06%           
=======================================
  Files         553      553           
  Lines       25239    25239           
=======================================
  Hits        23488    23488           
  Misses       1751     1751           

Impacted Files	Coverage Δ
snuba/settings/__init__.py	93.61% <100.00%> (ø)

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