Fix Snapshot returning magenta color Apple Metal

[taublast]

Bugs Fixed

Fixed bug when Flush() -> Snapshot() returns magenta color when using Apple Metal backend. Affects any backdrop logic.

Before / after

Credits to react/google folks: https://groups.google.com/g/skia-discuss/c/FTO0NSR_09Q/m/U0jO5E35AgAJ

API Changes

None.

Behavioral Changes

None.

Required skia PR

None.

PR Checklist

• Has tests (if omitted, state reason in description)
• Rebased on top of main at time of PR
• Merged related skia PRs
• Changes adhere to coding standard
• Updated documentation

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