BF: Only forceEndRoutine on new clicks on a Button

[TEParsons]

No description provided.

[codecov]

Codecov Report

Merging #3641 (6993a3b) into release (c4101af) will decrease coverage by 0.00%.
The diff coverage is 50.00%.

@@             Coverage Diff             @@
##           release    #3641      +/-   ##
===========================================
- Coverage    43.20%   43.19%   -0.01%     
===========================================
  Files          267      267              
  Lines        52751    52753       +2     
  Branches      9100     9102       +2     
===========================================
- Hits         22790    22788       -2     
- Misses       27640    27642       +2     
- Partials      2321     2323       +2     

Impacted Files	Coverage Δ
psychopy/experiment/components/button/__init__.py	79.13% <50.00%> (-1.41%)	⬇️
psychopy/web.py	36.53% <0.00%> (-1.29%)	⬇️

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[coveralls]

Coverage increased (+0.0001%) to 47.042% when pulling 6993a3b on TEParsons:_buttonForceEnd into c4101af on psychopy:release.