Fix: Fixed issue with copying text from rename text box

[XAN9xXx]

Resolved / Related Issues

• Closes Bug: Can't copy text from rename text box #18820

Description

Opening the item context menu leaves its primary command keyboard accelerators active after the flyout closes. This allows the CopyItem command to override Ctrl+C while the rename TextBox has focus.

This change clears the primary command button accelerators when FastContextFlyout closes.

Steps used to test these changes

1. Opened Files and selected a folder.
2. Opened and closed the item context menu.
3. Started renaming the selected folder from the command bar.
4. Selected part of the name and pressed Ctrl+C.
5. Pasted into another text box and verified that the selected text was copied instead of the folder.
6. Exited rename mode, selected a folder, and verified that Ctrl+C still copies the selected folder.

[CLAassistant]

All committers have signed the CLA.

[yair100]

@XAN9xXx congrats on your first PR to Files!

[XAN9xXx]

Thanks! Glad to contribute, and thanks for the review!