Add toggle button to VPAD show screen input

[goeiecool9999]

In addition to adding a checkbox this also alters the behaviour of pressing the "show screen" button. Currently if you enable the "Launch with gamepad view" option in the game profile, pressing the button does nothing. I've changed it so it acts like the TAB key and shows the TV screen.

I'm not happy with the alignment of the volume slider and the checkbox. That's the main reason why this is marked as draft. I think it needs to look a little more polished.
EDIT: I've added a windows screenshot since writing this and I think it doesn't look as bad on windows.
Closes: #1373
Closes: #916

[goeiecool9999]

I figured out how to align the text so the PR is ready now.

[Exzap]

I don't think it's clear to the user what toggle screen actually means in this context and that it relates to the show screen button. You should at the very least add a tooltip that explains what it does, but maybe you can think of a better solution that is more intuitive. I was never super happy with show screen either, but there is not enough space for show GamePad screen.

Also, put the label on the left and then have the text-less checkbox on the right of it. That way it will visually line up with the above options. I think that makes more sense than having it line up with the volume slider

[goeiecool9999]

but maybe you can think of a better solution that is more intuitive.

I tried making a box around it with wxStaticBox but I couldn't figure out how to make it look good 🤷
This is what it looks like now: