If the emulator is paused when selecting Emulation -> Stop, then resume so the core can shutdown as requested.
This'll make Stop more like Reset, which resets regardless of the pause state.
Merge pull request #4733 from thedax/win32MenuTweak

Win32 menu: If the emulator is paused (via Emulation -> Pause) when selecting Emulation -> Stop, resume the emulation so it can stop.