Disable refresh on CTRL+R

[theo2354]

Right now, as the app is electron, hitting ctrl+r refreshes the app. However, adding a time manually, if you have a timer without a connecting cord, is done by hitting ctrl+t. It makes it so that sometimes, when I want to add a time, I missclick and refresh instead, losing the scramble.

Not that it is really a common usecase, but the ctrl+r bind serves little to no purpose in my humble opinion.

If you are open to this change please tell me and I will submit a pull request.

Thank you for having made the only Linux compatible timer ;)