Simplify system stop error check in macOS screen capture #4663

Job	Run time
Typecheck	1m 15s
Lint (Biome)	11s
Detect Changes	8s
Format (Biome)	10s
Format (Cargo)	16s
Clippy (aarch64-apple-darwin, macos-latest)	1m 22s
Verify Tauri plugin versions	0s
Rust cache	-1s
Build Desktop	-1s
	3m 20s

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