GC2D/CardSave: fix inverted save-time check and selection signedness

[gitRasheed]

The save-time check in execMovement_ stored the states on the wrong branches, and waitForSelect3 copied the s8 selection into a u8.

[decomp-dev]

Report for GMSJ01 (2749193 - b3840d6)

📈 2 improvements in unmatched items

Unit	Item	Bytes	Before	After
mario/GC2D/CardSave	TCardSave::waitForSelect3(TEProgress, TEProgress, TEProgress)	+18	99.11%	99.86%
mario/GC2D/CardSave	TCardSave::execMovement_()	0	99.69%	99.69%

---

Report for GMSP01 (2749193 - b3840d6)

📈 2 improvements in unmatched items

Unit	Item	Bytes	Before	After
mario/GC2D/CardSave	TCardSave::waitForSelect3(TEProgress, TEProgress, TEProgress)	+18	95.65%	96.38%
mario/GC2D/CardSave	TCardSave::execMovement_()	0	99.01%	99.01%