(Fix) atomic counter updates in SubtitleController

[howardlau1999]

It is recommended to use increment method of an object to update counter values to avoid concurrency bugs.

[codecov]

Codecov Report

Merging #1430 into master will decrease coverage by 0.80%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #1430      +/-   ##
============================================
- Coverage     26.97%   26.17%   -0.81%     
  Complexity     4278     4278              
============================================
  Files           305      305              
  Lines         13538    13537       -1     
============================================
- Hits           3652     3543     -109     
- Misses         9886     9994     +108     

Impacted Files	Coverage Δ	Complexity Δ
app/Http/Controllers/SubtitleController.php	0.00% <0.00%> (ø)	23.00 <0.00> (ø)
app/Services/Data/Person.php	0.00% <0.00%> (-87.50%)	7.00% <0.00%> (ø%)
app/Services/Data/Genre.php	0.00% <0.00%> (-60.00%)	7.00% <0.00%> (ø%)
app/Services/Clients/TmdbClient.php	6.91% <0.00%> (-45.63%)	90.00% <0.00%> (ø%)
app/Services/Clients/Client.php	62.06% <0.00%> (-24.14%)	15.00% <0.00%> (ø%)
app/Services/Data/Movie.php	17.46% <0.00%> (-15.88%)	40.00% <0.00%> (ø%)
app/Http/Controllers/API/TorrentController.php	60.81% <0.00%> (-1.23%)	111.00% <0.00%> (ø%)
app/Http/Controllers/AnnounceController.php	45.27% <0.00%> (ø)	66.00% <0.00%> (ø%)
app/Models/User.php	40.47% <0.00%> (+0.39%)	122.00% <0.00%> (ø%)
app/Http/Controllers/CommentController.php	77.37% <0.00%> (+1.45%)	46.00% <0.00%> (ø%)
... and 4 more

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