[BUG] assetsGrid color has a fixed value of black54 and is not customizable

[SchnMar]

Describe the bug (描述)
The assetsGrid background color has a fixed value of black54.

Expected behavior (期望行为)
Should use backgroundColor from pickerTheme instead.

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.