logic/joystick: fix multiple bugs

- the enumerator and the handle list are now static; joysticks were
erroneously destructed during refresh
- setup dinput only once; creating LPDIRECTINPUT8 many times causes
Release() to invalidate all handles
- don't create joystick handles many times; same thing applies
- refresh joy list on failed acquire; usually joystick is unplugged at
that moment leading to endless stderr spam
- use a static mutex as to avoid dinput races

Issue: #315

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