[FotMob] Get correct team match stats using 'opponent_stats' parameter

[marcjbaron]

This fixes the issue brought up in #528 where the opponent_stats=True parameter setting returned only the opponent stats, but incorrectly labelled as the requested team's stats. When opponent_stats=True, the correctly labelled match stats for both teams should now be returned.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 63.66%. Comparing base (69fb0de) to head (e75273a).
Report is 165 commits behind head on master.

Files with missing lines	Patch %	Lines
soccerdata/fotmob.py	0.00%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #541      +/-   ##
==========================================
+ Coverage   59.33%   63.66%   +4.32%     
==========================================
  Files          11       12       +1     
  Lines        1633     1910     +277     
  Branches      336      386      +50     
==========================================
+ Hits          969     1216     +247     
- Misses        610      629      +19     
- Partials       54       65      +11     

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