Editing keybord shortcuts opens dialog when double clicking

### Bug description

the current way to edit a keyboard shortcut is, go to prfs click on Keyboard shortcuts , now there is nowhere to actually add a key, you have to figure out that you need to DOUBLE CLICK on it , for it to open a dialog
there is no visual indication for the user that the way to edit is to double click

### Steps to reproduce

Go to Preferences
click on keyboard shortcuts
try to change / add a shortcut
you will have to double click on it to open a dialog

### Expected behavior

there should be a text input field where you can input a key / key comination

### Actual behavior

you have to Double click for it to open a dialog

which we know
if (dialog not strictly needed) {
dialog = bad;
}

### Audacity Version

AU4 Alpha 2

### Operating system

Windows

### Additional context

_No response_