Input/Hotkeys are locked in QWERTY

Description

When binding/rebinding inputs under the 'Input' menu, Retroarch behaves as if the keyboard is in the QWERTY layout, even if it is set to a different layout in the OS. Searching (with /) is not affected.

For example, 'Fullscreen Toggle' is bound to F by default. Pressing my F key doesn't do anything since it is mapped to my right hand in my layout. Pressing the T key works, however, since my T is where QWERTY's F is (left hand, index finger, home row).

I can manually bind fullscreen to my F key, but the menu shows it bound to U instead, since QWERTY's U is where my F is. This is a reasonable workaround but would make rebinding confusing. It also initializes all the shortcuts to the wrong keys by default. (This is debatable--control keys [z,x,c etc] are chosen based on position, so should depend on physical position, not legend, but most other keys have mnemonics [f for fullscreen, m for mute etc], so should map to a specific letter).

Tested with a default config. To reproduce, set a non-QWERTY layout and bind some keys to test one-by-one; the top row will spell out QWERTY no matter what.

Bisect

Highly likely related to #8303. This used to work, but I hadn't used RA on a machine with a non-QWERTY layout in a while. I don't have a build environment set up but I could if it's necessary.

Environment

• RetroArch: 1.8.4 9e25601
• OS: Kubuntu 19.10

Start from RetroArch's Input menu and compare its key binding behavior with the non-QWERTY OS layout described here; review related issue #8303 for historical context. Done means bindings and default shortcuts use the intended physical or labeled keys consistently instead of assuming QWERTY.