Fix control pixel snap rounding using floor() instead of round()
Fix control pixel snap rounding using floor() instead of round()

This resulted in small leftwards/upwards movement of controls being
faster than it should be.

This closes #19763.

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