Remove unnecessary Integer.toString() calls

[Deskana]

Remove unnecessary Integer.toString() calls

In cases where an integer is directly concatenated onto a string, toString() is not needed because it is called implicitly; this patch removes the calls to improve code readability.

Tests performed (required)

Tested prodDebug on Pixel 2 emulator with API level 25.

Screenshots showing what changed

Code style and performance improvement, so no screenshots.

[codecov-io]

Codecov Report

Merging #2959 into master will not change coverage.
The diff coverage is 0%.

@@          Coverage Diff           @@
##           master   #2959   +/-   ##
======================================
  Coverage    3.69%   3.69%           
======================================
  Files         247     247           
  Lines       12214   12214           
  Branches     1081    1081           
======================================
  Hits          451     451           
  Misses      11729   11729           
  Partials       34      34

Impacted Files	Coverage Δ
...nrw/commons/achievements/AchievementsActivity.java	0% <0%> (ø)	⬆️
...ava/fr/free/nrw/commons/upload/UploadActivity.java	0% <0%> (ø)	⬆️

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[misaochan]

Thanks @Deskana !