Make map name search case-insensitive

[Marc-Spector]

Closes #2839

[codecov]

Codecov Report

Merging #2840 (d79d765) into develop (14fb8d9) will increase coverage by 0.02%.
The diff coverage is 100.00%.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #2840      +/-   ##
=============================================
+ Coverage      65.63%   65.66%   +0.02%     
- Complexity      5067     5071       +4     
=============================================
  Files            550      550              
  Lines          20631    20635       +4     
  Branches        1158     1159       +1     
=============================================
+ Hits           13542    13549       +7     
+ Misses          6416     6413       -3     
  Partials         673      673              

Impacted Files	Coverage Δ
...om/faforever/client/game/CreateGameController.java	71.95% <100.00%> (+0.72%)	⬆️
...main/java/com/faforever/client/map/MapService.java	72.48% <0.00%> (+0.59%)	⬆️

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