glTF: Fixed mistake with root node calculation in skin_verify
glTF: Fixed mistake with root node calculation in skin_verify

Was not actually grabbing the computed roots for comparison, but instead
was grabbing the disjoint_set representatives.

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