Backspace doesn't work while Shift key is pressed, in the script editor

[Chaosus]

Godot version

fbb5a54

System information

Windows 10

Issue description

Pressing the backspace key to remove the previous symbol in the script editor does not work if the shift is pressed. This is regression not presented in 3.3.

Steps to reproduce

Create a script and try.

Minimal reproduction project

Too easy to reproduce.

[Calinou]

I can confirm this on master Git dfc88bc on Linux. I was pretty sure I reported it at some point, but I can't find an issue about it right now.

[EricEzaM]

A regression from #43663 because the shortcuts use "exact match" for their checking. This is because we have things like Ctrl+Backspace, etc which perform different actions, and we do not want overlap of those.

The safe option here I suppose is to just add Shift+Backspace to the list of commands, as done in the PR linked above.