web: wysiwyg editor shouldn't insert backticks on ^e on macOS #4657

The keyboard shortcut for inserting code backticks appears to be cmd+e on macOS, but ctrl-e seems to be bound to the same action. On macOS, ctrl-e normally moves the cursor to the end of the line, so this makes it pretty annoying to edit text when writing issues (it's already happened to me twice while editing this).