Fix Enable continue command if the debbuger is active for pressing F5

[laemmleint]

What it does

This PR should solve the problem with the F5 key binding -> Issue: #14639
By default the key f5 is registered to "start debugging", "continue" and "refresh/reload" (if it is a browser app).

The desired behavior should be as follows:

• No debugger is started, then F5 starts the debugger
• The debugger is started, then only 'continue' works

In none of the cases should F5 result in a reload of the application if it is running in a web browser.

All other shortcuts should continue to work.

How to test

• Start Theia (current: 1.56.2) in a webbrowser
• Please use 'Steps to Reproduce' from Key F5 is assigned to 'run' and 'continue' simultaneously #14639

With the suggestion fix
8ec7557
the behaviour is much better while press and hold the F5 key.

Follow-ups

Breaking changes

Attribution

Contributed by MVTec Software GmbH

Review checklist

As an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• As a reviewer, I agree to behave in accordance with the review guidelines

[tsmaeder]

While the enablement of the "continue" action is more correct with this PR, aren't both keybindings still active and it's basically random whether "start" or "continue" are being executed when both are possible?

[msujew]

@tsmaeder I believe so as well, see the discussion over at #14639.