Using `Enter` to close the `Change Title` dialog

[Korb]

After implementing #56, it will be appropriate to use Enter, Shift + Enter, and Ctrl + Enter to close the window, confirming changes made to the input field.

Currently, pressing Enter and all Enter combinations with modifiers result in a line feed, and navigating to the OK button using the keyboard is only possible using the Tab key.

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SmartContextMenu 1.7.2 (Sep 20, 2025)
Microsoft Windows 10.0.26200.7623