Fix users filtering by input value in User rating

[akivonen]

Fixes #2043
Changed user filtering logic: Now shows only users whose usernames start with the input value, instead of containing it.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.51%. Comparing base (ca90a67) to head (ac8a4de).
Report is 94 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2060      +/-   ##
==========================================
+ Coverage   59.20%   59.51%   +0.31%     
==========================================
  Files         249      249              
  Lines        5201     5205       +4     
==========================================
+ Hits         3079     3098      +19     
+ Misses       2122     2107      -15     

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[vtm9]

i like containing more than stat.