Fix LegateLaniusCaesarsAce counting non-controlled creatures

[ssk97]

Fixes #12178

[Susucre]

Oh right, Battlefield::count counts all the permanents matching the filter in the range of influence of the player. It is usually used with a FilterControlledPermanent, but there was no controller predicate here.

I think we could rename the method into one not having the ambiguity? But not sure how other think of it, maybe that's fine as is.

[xenohedron]

I prefer using a filter with a controller predicate, and the count method that respects range of influence and checks ObjectSourcePlayerPredicates in the filter. The countAll method only calls filter.match with two arguments so is not best style, even though it usually doesn't cause any bugs (and yes, that is used all over the codebase, and fixing such usages would be a lot of work).