[BugFix] Football u_shoot_multiplier

[matteobettini]

The idea is that (assuming the action = y and u_shoot_multiuplier =0.6, default)

y + 0.6 = y * 2.67 * 0.6

fixes #155

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 87.13%. Comparing base (4a5b53e) to head (a8e8766).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
vmas/scenarios/football.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #156   +/-   ##
=======================================
  Coverage   87.13%   87.13%           
=======================================
  Files          93       93           
  Lines       10462    10462           
=======================================
  Hits         9116     9116           
  Misses       1346     1346           

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