[BUG] using pickerTheme argument always causes error

[SchnMar]

Describe the bug (描述)
Using a customPickerTheme as an argument always causes an error "'Theme and theme color cannot be set at the same time.'"

How to reproduce (如何复现)
This is caused as the optional parameter themeColor has a standard value of C.themeColor when no value is passed as an argument. You have to explicitly set themeColor to null to use a customPickerTheme.

Expected behavior (期望行为)
Using customPickerTheme without having to explicitly set themeColor to null is possible.

[lock]

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