Make sure tagged skills are increased by at least the intended amount

[NovaRain]

This is mainly to address this known issue:

• Sierra Military Base:
  • Punching bags give +5% to Unarmed, but only +4% if it's tagged. (In fact, that applies to all instances of increasing skills by scripts).

I'll push the same changes to RPU later if you think this tweak is acceptable.

[burner1024]

Sure, cool!
If you want to add some jsdoc to the function, even better.