Script editor: Don't open dominant script in external editor
Script editor: Don't open dominant script in external editor

Fixes #13429.

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