GS/VertexTrace: Fix min/max when last provoking vertex unsupported #5645
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Description of Changes
This was causing incorrect min/max alpha values due to the index swap, which caused the sides of text boxes in KH to disappear (because the alpha test optimized to always failing).
Closes #5639.
Rationale behind Changes
Fixing my regressions :(
Suggested Testing Steps
Check KH, and any other games sensitive to IIP=0/provoking vertex last (I've quickly checked Tony Hawk's American Wasteland).