Ensure minimum modifiers are pressed when matching actions

[madmiraal]

#54173 modified the action_match methods, but dropped the check for matching the minimum modifiers when a key or button is pressed.
Before:

godot/core/input/input_event.cpp

Lines 428 to 431 in 8b8e858

	Key code = get_keycode_with_modifiers();
	Key event_code = key->get_keycode_with_modifiers();
	match = get_keycode() == key->get_keycode() && (!key->is_pressed() || (code & event_code) == code);

After:

godot/core/input/input_event.cpp

Line 428 in 81c2d7a

match &= get_modifiers_mask() == key->get_modifiers_mask();

This PR reintroduces that check.

Fixes #57943

[EricEzaM]

Based on your comment/analysis of the issue here, I think this is the correct fix. Even with exact being false, pressing D should not trigger an action with event Ctrl+D. The minimum modifiers should be respected. Pressing Ctrl+Shift+D however, would still trigger Ctrl+D if exact is false, which is the desired behaviour I believe.

However, looking back at the doco which was written, it probably is not worded 100% correct. I added this feature (exact matches) but did not write the doco - so that's at least partially my fault.

If exact_match is false, it ignores the input modifiers for InputEventKey and InputEventMouseButton events, and the direction for InputEventJoypadMotion events.

It would probably be more correct to say

If exact_match is false, it ignores additional input modifiers for InputEventKey... [etc]

[madmiraal]

Updated the documentation as suggested.

[akien-mga]

Thanks for the in depth review and fix! It's not easy to wrap one's head around all the subtleties of input with modifiers :)