[google_maps_flutter] Fix iOS &/&& logic

[stuartmorgan-g]

Fixes incorrect use of && and & in the tile downscaling logic added in #6377

The code would generally do the right thing by accident, because isFloat would always end up true, so it would downsample any 16-bit image. The incorrect operators cause complitation failure in some compilation environments, however (like google3).

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[stuartmorgan-g]

test-exempt: failure is caught in google3 compilation environment

[gemini-code-assist]

Code Review

This pull request corrects bitwise and logical operators in FGMTileOverlayController.m across multiple iOS Google Maps packages to address compilation and logical issues in tile downscaling. The review feedback points out that assigning the bitwise result directly to a BOOL can lead to truncation and incorrect evaluation on certain architectures, and suggests explicitly comparing the result to 0.