Adds the ability to go back to the home menu with Rosalina

[b-m-f]

This MR offers a solution for https://github.com/LumaTeam/Luma3DS/issues/1516/ .

Unfortunately I was not able to close the Menu automatically and still trigger the home button pressed event. I saw a glitched menu and could not reopen it.

For me this works just fine though, as I can finally use my 3DS with the broken Home Button.

[holly-hacker]

Hi, is anything blocking this PR? It seems quite useful during development when the app I sent with 3dslink crashes and doesn't respond to Home presses.

[PabloMK7]

With a few changes it should be good. For example add a way to cancel if the B button is pressed and only go to the home menu if A is pressed. The current press A to confirm prompt doesn't actually confirm anything as the home button press is done anyways.