phpstan: dynamic SmrMines::TOTAL_ENEMY_MINES_MODIFIER
phpstan: dynamic SmrMines::TOTAL_ENEMY_MINES_MODIFIER

This class constant is technically not dynamic (we don't expect to
change it), but if we _do_ change it, we want to make sure that the
protections against a value of 0 are already in place.

Fixes PHPStan warning:

> Comparison operation ">" between 25 and 0 is always true.

hemberger/smr,smrealms/smr,hemberger/smr,hemberger/smr,hemberger/smr,smrealms/smr,smrealms/smr