Removes obsolete code and adds comments in AIGroup::Group_Tighten_To_Position

[bobtista]

Addresses #915

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (5529abc) 2.97% compared to head (4799ded) 2.97%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           develop    #937   +/-   ##
=======================================
  Coverage     2.97%   2.97%           
=======================================
  Files          803     803           
  Lines        80345   80340    -5     
  Branches     13761   13760    -1     
=======================================
  Hits          2387    2387           
+ Misses       77615   77609    -6     
- Partials       343     344    +1     

Impacted Files	Coverage Δ
src/game/logic/ai/aigroup.cpp	0.00% <ø> (ø)

... and 1 file with indirect coverage changes

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[xezon]

Change looks ok. Does not need to be merged before Standalone.