C#: Fix `double` casting in wasm m2n trampolines
C#: Fix `double` casting in wasm m2n trampolines

The trampolines were casting double to `size_t` (likely a copy-paste
mistake), so the value was getting truncated.

akien-mga/godot,sanikoyes/godot,Zylann/godot,Faless/godot,DmitriySalnikov/godot,pkowal1982/godot,pkowal1982/godot,ZuBsPaCe/godot,Shockblast/godot,ZuBsPaCe/godot,ZuBsPaCe/godot,DmitriySalnikov/godot,Shockblast/godot,MarianoGnu/godot,vkbsb/godot,ZuBsPaCe/godot,firefly2442/godot,Valentactive/godot,Zylann/godot,guilhermefelipecgs/godot,josempans/godot,ZuBsPaCe/godot,josempans/godot,vkbsb/godot,sanikoyes/godot,DmitriySalnikov/godot,Zylann/godot,pkowal1982/godot,Zylann/godot,firefly2442/godot,Valentactive/godot,honix/godot,akien-mga/godot,MarianoGnu/godot,sanikoyes/godot,MarianoGnu/godot,vnen/godot,sanikoyes/godot,guilhermefelipecgs/godot,josempans/godot,guilhermefelipecgs/godot,honix/godot,MarianoGnu/godot,firefly2442/godot,Valentactive/godot,Faless/godot,akien-mga/godot,vkbsb/godot,sanikoyes/godot,ZuBsPaCe/godot,josempans/godot,vnen/godot,Zylann/godot,Faless/godot,Shockblast/godot,Faless/godot,guilhermefelipecgs/godot,Faless/godot,guilhermefelipecgs/godot,Valentactive/godot,BastiaanOlij/godot,BastiaanOlij/godot,BastiaanOlij/godot,Valentactive/godot,ZuBsPaCe/godot,godotengine/godot,firefly2442/godot,Shockblast/godot,godotengine/godot,guilhermefelipecgs/godot,Valentactive/godot,godotengine/godot,Faless/godot,pkowal1982/godot,vnen/godot,vnen/godot,josempans/godot,BastiaanOlij/godot,vnen/godot,vkbsb/godot,pkowal1982/godot,MarianoGnu/godot,vnen/godot,pkowal1982/godot,godotengine/godot,MarianoGnu/godot,pkowal1982/godot,BastiaanOlij/godot,Zylann/godot,sanikoyes/godot,vkbsb/godot,firefly2442/godot,akien-mga/godot,vkbsb/godot,Shockblast/godot,godotengine/godot,DmitriySalnikov/godot,akien-mga/godot,firefly2442/godot,BastiaanOlij/godot,DmitriySalnikov/godot,pkowal1982/godot,vkbsb/godot,DmitriySalnikov/godot,godotengine/godot,honix/godot,firefly2442/godot,BastiaanOlij/godot,Shockblast/godot,BastiaanOlij/godot,sanikoyes/godot,ZuBsPaCe/godot,DmitriySalnikov/godot,Faless/godot,Faless/godot,honix/godot,firefly2442/godot,honix/godot,Zylann/godot,godotengine/godot,MarianoGnu/godot,Shockblast/godot,honix/godot,Shockblast/godot,sanikoyes/godot,josempans/godot,vnen/godot,josempans/godot,Valentactive/godot,Zylann/godot,guilhermefelipecgs/godot,vkbsb/godot,josempans/godot,akien-mga/godot,godotengine/godot,MarianoGnu/godot,akien-mga/godot,vnen/godot,Valentactive/godot,guilhermefelipecgs/godot,akien-mga/godot