fix(defineShortcuts): support minus - key

[smarroufin]

🔗 Linked issue

Fixes #954

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Here is a fix to the - shortcut using defineShortcuts, which has been broken when chained shortcuts were introduced.

Though, it fixes a bug but leverages some issues on more advanced usecases (complex keys).
The current separators for combined and chained shortcuts are _ and -. And their combination in the same key is quite complex.
We could image being able to handle _-_ (two hits on _), or e_- (combination of e and -). A non-exhaustive list of shortcuts that should work IMO: ['e_-', 'e__', '_-_', '---', '_--'].

But let's fix this current issue and potentially create a new one for advanced shortcuts, or wait to see if the demand actually exists.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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Name	Status	Preview	Updated (UTC)
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[smarroufin]

Ok. Just as I pushed my PR, I realised it does not fix the related issue which is the combination of shift and -.

[appinteractive]

@smarroufin none of the - key listeners worked, so it still should help with the other cases. 🤞