win32: use HINST_THISCOMPONENT

This is a common idiom used in MSDN docs and Raymond Chen's example
programs to get a HINSTANCE for the current module, regardless of
whether it's an .exe or a .dll. Using GetModuleHandle(NULL) for this is
technically incorrect, since it always gets a handle to the .exe, even
when the executing code (in libmpv) is running in a .dll. In this case,
using the wrong HINSTANCE could cause namespace issues with window
classes, since CreateWindowEx uses the HINSTANCE to search for the
matching window class name.

See:
https://blogs.msdn.microsoft.com/oldnewthing/20050418-59/?p=35873
https://blogs.msdn.microsoft.com/oldnewthing/20041025-00/?p=37483

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