GDScript: check for underscore prefix when type-checking
GDScript: check for underscore prefix when type-checking

Some classes are represented internally with an underscore prefix, so we
need to make sure we match this representation when type-checking,
otherwise the check might fail on a valid scenario.

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