BaseButton: Make shortcuts call virtual methods

When buttons are not in Toggle Mode, shortcuts used to only trigger the
`pressed` signal, without calling the `_pressed` virtual method,
contrarily to what happens when you click the button.

For Toggle Mode buttons, it did call the `_toggled` virtual method
together with emitting the `toggled` signal *twice*.

This commit harmonizes it all and makes shortcuts behave the same as
mouse clicks or `ui_accept`, for both toggle and non-toggle modes.

Fixes #29604.

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