GS/HW: Ignore alpha on double half clear if not used #11277
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Description of Changes
Don't care about alpha on double half clear if the game isn't using it, or it's all black (as the clear is writing on the Z)
Rationale behind Changes
Tony Hawk Pro Skater 4 does this clear with the alpha masked, but Z32 for the bottom half (so writes to alpha area). Normally we avoid this because it's not really acceptable for a double half clear, but in this case, the game isn't actually using the alpha, and so it's black, so writing to it doesn't really matter.
Suggested Testing Steps
Test Tony Hawk Pro Skater 4 and look for some water, put it in the lower half of the screen.
Master (this did just multiply before until it was as bright as the sun:
PR: