Fix Redundant Navigation Polygons
Fix Redundant Navigation Polygons

When adjusting the vertices of a navigation polygon, the tile editor would create a duplicate navigation polygon.  So each time you made an adjustment, another copy of the polygon would be created.
guilhermefelipecgs/godot,DmitriySalnikov/godot,ZuBsPaCe/godot,godotengine/godot,Valentactive/godot,firefly2442/godot,Valentactive/godot,sanikoyes/godot,ZuBsPaCe/godot,Valentactive/godot,firefly2442/godot,honix/godot,Faless/godot,vnen/godot,Shockblast/godot,Zylann/godot,Zylann/godot,godotengine/godot,vkbsb/godot,firefly2442/godot,Valentactive/godot,firefly2442/godot,godotengine/godot,godotengine/godot,Valentactive/godot,sanikoyes/godot,akien-mga/godot,guilhermefelipecgs/godot,Paulloz/godot,pkowal1982/godot,guilhermefelipecgs/godot,BastiaanOlij/godot,Shockblast/godot,firefly2442/godot,MarianoGnu/godot,MarianoGnu/godot,josempans/godot,pkowal1982/godot,Shockblast/godot,firefly2442/godot,godotengine/godot,vkbsb/godot,akien-mga/godot,DmitriySalnikov/godot,godotengine/godot,BastiaanOlij/godot,Faless/godot,josempans/godot,ex/godot,vnen/godot,sanikoyes/godot,Faless/godot,akien-mga/godot,Faless/godot,vnen/godot,godotengine/godot,guilhermefelipecgs/godot,Shockblast/godot,Faless/godot,ZuBsPaCe/godot,akien-mga/godot,ex/godot,josempans/godot,vkbsb/godot,sanikoyes/godot,Shockblast/godot,Zylann/godot,DmitriySalnikov/godot,pkowal1982/godot,honix/godot,sanikoyes/godot,Valentactive/godot,BastiaanOlij/godot,ex/godot,Faless/godot,josempans/godot,Faless/godot,josempans/godot,Paulloz/godot,pkowal1982/godot,vnen/godot,ex/godot,Shockblast/godot,Paulloz/godot,sanikoyes/godot,firefly2442/godot,ZuBsPaCe/godot,akien-mga/godot,ZuBsPaCe/godot,MarianoGnu/godot,Zylann/godot,ex/godot,vkbsb/godot,vkbsb/godot,BastiaanOlij/godot,josempans/godot,MarianoGnu/godot,DmitriySalnikov/godot,vkbsb/godot,ex/godot,MarianoGnu/godot,Zylann/godot,MarianoGnu/godot,DmitriySalnikov/godot,vnen/godot,ZuBsPaCe/godot,Zylann/godot,honix/godot,MarianoGnu/godot,josempans/godot,MarianoGnu/godot,pkowal1982/godot,pkowal1982/godot,Valentactive/godot,Faless/godot,Zylann/godot,Valentactive/godot,DmitriySalnikov/godot,guilhermefelipecgs/godot,BastiaanOlij/godot,guilhermefelipecgs/godot,firefly2442/godot,sanikoyes/godot,vnen/godot,guilhermefelipecgs/godot,sanikoyes/godot,honix/godot,Paulloz/godot,vkbsb/godot,ex/godot,godotengine/godot,BastiaanOlij/godot,vkbsb/godot,Shockblast/godot,Paulloz/godot,Zylann/godot,akien-mga/godot,josempans/godot,BastiaanOlij/godot,pkowal1982/godot,honix/godot,akien-mga/godot,guilhermefelipecgs/godot,vnen/godot,pkowal1982/godot,ZuBsPaCe/godot,vnen/godot,BastiaanOlij/godot,Paulloz/godot,DmitriySalnikov/godot,Shockblast/godot,Paulloz/godot,honix/godot,akien-mga/godot,ZuBsPaCe/godot,ex/godot