Fix BMP loader incorrectly interpreting color table size
Fix BMP loader incorrectly interpreting color table size

Color table should exist for images with bit count <= 8. Importing 16-bit
BMP images could also likely have a color table but they're not currently
supported in Godot.

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