[FIX] Month order in alliance stats view (#377)

[ppfeufer]

Description

Fixed

• Month order in alliance stats view

Fixes #377

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality not to work as expected)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented on my code, particularly in hard-to-understand areas
• I have checked my code and corrected any misspellings

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.58%. Comparing base (0f3223b) to head (f51339e).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #384   +/-   ##
=======================================
  Coverage   70.58%   70.58%           
=======================================
  Files          28       28           
  Lines        1295     1295           
  Branches      112      112           
=======================================
  Hits          914      914           
  Misses        361      361           
  Partials       20       20           

Files with missing lines	Coverage Δ
afat/views/statistics.py	93.02% <ø> (ø)

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