GS/HW: Ensure valid alpha doesn't get cleared on 24-bit targets #11151
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Description of Changes
Pitfall: The Lost Expedition clears a Z24 depth buffer via a colour write, that was previously the target of a G->A channel shuffle, then uses it as a texture. We were clearing the target, despite it still having valid data in the alpha channel. So, don't do that.
Rationale behind Changes
Fixes #11150.
Suggested Testing Steps
Check linked GS dump / game.