Fix file size reader

[Sheikah45]

Closes #3045

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (4fdd77d) 59.07% compared to head (60d0658) 59.09%.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #3095      +/-   ##
=============================================
+ Coverage      59.07%   59.09%   +0.01%     
- Complexity      4409     4412       +3     
=============================================
  Files            562      562              
  Lines          20159    20159              
  Branches        1014     1014              
=============================================
+ Hits           11909    11913       +4     
+ Misses          7709     7707       -2     
+ Partials         541      539       -2     

Files	Coverage Δ
...java/com/faforever/client/util/FileSizeReader.java	8.33% <0.00%> (ø)

... and 2 files with indirect coverage changes

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