Fixes touch events for HTML
Fixes touch events for HTML

Without this patch, the following exception is thrown when the touch
screen is used: TypeError: e.getBoundingClientRect is not a function.
No touch events arrive in the engine.

From my testing, this PR fixes the issue and behaves as expected.

Tested with godot-demo-projects/misc/multitouch_view/, emscripten 1.39.8
and Firefox mobile emulator as well as FF on Android

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