Fixed up a couple of license names in COPYRIGHT.txt
Fixed up a couple of license names in COPYRIGHT.txt

A couple of entries were using SPDX name over the Debian standard ones.
Switched these over and noted this policy at the top of the file to avoid
confusion.

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