Windows: Properly set `mouse_monitor` instead of shadowing it
Windows: Properly set `mouse_monitor` instead of shadowing it

GCC was raising a warning about unused variable, but it's actually meant
to be used in the destructor for deinit.

firefly2442/godot,BastiaanOlij/godot,josempans/godot,firefly2442/godot,BastiaanOlij/godot,josempans/godot,Shockblast/godot,akien-mga/godot,pkowal1982/godot,vkbsb/godot,Shockblast/godot,firefly2442/godot,ZuBsPaCe/godot,Valentactive/godot,Zylann/godot,sanikoyes/godot,Zylann/godot,josempans/godot,josempans/godot,vkbsb/godot,Valentactive/godot,Valentactive/godot,godotengine/godot,godotengine/godot,akien-mga/godot,guilhermefelipecgs/godot,Valentactive/godot,ZuBsPaCe/godot,pkowal1982/godot,guilhermefelipecgs/godot,Valentactive/godot,pkowal1982/godot,Zylann/godot,sanikoyes/godot,firefly2442/godot,godotengine/godot,godotengine/godot,ZuBsPaCe/godot,Zylann/godot,Zylann/godot,BastiaanOlij/godot,ZuBsPaCe/godot,sanikoyes/godot,Zylann/godot,godotengine/godot,guilhermefelipecgs/godot,guilhermefelipecgs/godot,akien-mga/godot,BastiaanOlij/godot,Shockblast/godot,firefly2442/godot,ZuBsPaCe/godot,Valentactive/godot,Shockblast/godot,ZuBsPaCe/godot,josempans/godot,firefly2442/godot,vkbsb/godot,Shockblast/godot,firefly2442/godot,ZuBsPaCe/godot,Shockblast/godot,akien-mga/godot,ZuBsPaCe/godot,guilhermefelipecgs/godot,pkowal1982/godot,pkowal1982/godot,pkowal1982/godot,josempans/godot,vkbsb/godot,BastiaanOlij/godot,firefly2442/godot,josempans/godot,vkbsb/godot,akien-mga/godot,Valentactive/godot,sanikoyes/godot,godotengine/godot,guilhermefelipecgs/godot,akien-mga/godot,vkbsb/godot,sanikoyes/godot,vkbsb/godot,BastiaanOlij/godot,sanikoyes/godot,godotengine/godot,Valentactive/godot,BastiaanOlij/godot,Zylann/godot,pkowal1982/godot,josempans/godot,vkbsb/godot,godotengine/godot,Zylann/godot,BastiaanOlij/godot,pkowal1982/godot,guilhermefelipecgs/godot,guilhermefelipecgs/godot,sanikoyes/godot,akien-mga/godot,Shockblast/godot,sanikoyes/godot,Shockblast/godot,akien-mga/godot