HotkeyScheduler: add PlayRecording hotkey support

[malleoz]

This hotkey was not previously implemented in the scheduler, even though it's present in the hotkey menu.

[malleoz]

I found there was unintended behavior when pressing Play Recording while a game was already running. Given that this was already not possible in previous dev versions (and quite frankly I don't see why it would be of much help), I have chosen to not recognize the hotkey if a game is running.

I've also identified a further hotkey issue, where hotkeys only work in the games list if "Hotkeys Require Window Focus" is disabled. A future PR should handle this, as it's a bit out of scope of the problem this PR aimed to solve.

Correction: Looks like this is all working as intended.

[dolphin-emu-bot]

FifoCI detected that this change impacts graphical rendering. Here are the behavior differences detected by the system:

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_{^{automated-fifoci-reporter}}