Correctly return JobClass#perform's return value

[st0012]

Fixes #1666

[davidwessman]

Thank you! Took the same time for me to refactor our use of the return value 🙂

[codecov-commenter]

Codecov Report

Merging #1667 (d2457c8) into master (4c0be87) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1667   +/-   ##
=======================================
  Coverage   98.47%   98.47%           
=======================================
  Files         136      136           
  Lines        7656     7664    +8     
=======================================
+ Hits         7539     7547    +8     
  Misses        117      117           

Impacted Files	Coverage Δ
sentry-rails/lib/sentry/rails/active_job.rb	100.00% <100.00%> (ø)
sentry-rails/spec/sentry/rails/activejob_spec.rb	99.29% <100.00%> (+0.03%)	⬆️

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[st0012]

@davidwessman No problem. Thank you for reporting the issue 😄
I'll need to sync changes between master and 4-8 branch though so it could take a bit longer to patch out a new version.