Color: Fix rounding error converting from float to 8-bit
Color: Fix rounding error converting from float to 8-bit

Fixes #16736.

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