GL: Fixed ETC1 format override logic.
GL: Fixed ETC1 format override logic.

janstk/bgfx,LWJGL-CI/bgfx,emoon/bgfx,marco-we/bgfx,darkimage/bgfx,mmicko/bgfx,LSBOSS/bgfx,jpcy/bgfx,Vertexwahn/bgfx,Vertexwahn/bgfx,ktotheoz/bgfx,MikePopoloski/bgfx,attilaz/bgfx,0-wiz-0/bgfx,darkimage/bgfx,Extrawurst/bgfx,fluffyfreak/bgfx,bkaradzic/bgfx,attilaz/bgfx,attilaz/bgfx,Extrawurst/bgfx,v3n/bgfx,fluffyfreak/bgfx,jdryg/bgfx,septag/bgfx,andr3wmac/bgfx,LSBOSS/bgfx,cyndis/bgfx,bkaradzic/bgfx,LWJGL-CI/bgfx,kondrak/bgfx,Synxis/bgfx,cuavas/bgfx,septag/bgfx,ktotheoz/bgfx,janstk/bgfx,aonorin/bgfx,sergeScherbakov/bgfx,jpcy/bgfx,fluffyfreak/bgfx,elmindreda/bgfx,jpcy/bgfx,sergeScherbakov/bgfx,mcanthony/bgfx,jdryg/bgfx,septag/bgfx,aonorin/bgfx,marco-we/bgfx,darkimage/bgfx,mendsley/bgfx,LWJGL-CI/bgfx,Extrawurst/bgfx,MikePopoloski/bgfx,Synxis/bgfx,ming4883/bgfx,marco-we/bgfx,0-wiz-0/bgfx,jdryg/bgfx,BlueCrystalLabs/bgfx,ocornut/bgfx,ocornut/bgfx,LWJGL-CI/bgfx,jpcy/bgfx,ocornut/bgfx,mcanthony/bgfx,cyndis/bgfx,cyndis/bgfx,cuavas/bgfx,jdryg/bgfx,mendsley/bgfx,elmindreda/bgfx,mmicko/bgfx,mcanthony/bgfx,sergeScherbakov/bgfx,mmicko/bgfx,kondrak/bgfx,emoon/bgfx,MikePopoloski/bgfx,andr3wmac/bgfx,BlueCrystalLabs/bgfx,BlueCrystalLabs/bgfx,v3n/bgfx,fluffyfreak/bgfx,bkaradzic/bgfx,cuavas/bgfx,janstk/bgfx,emoon/bgfx,Vertexwahn/bgfx,Synxis/bgfx,ming4883/bgfx,0-wiz-0/bgfx,aonorin/bgfx,v3n/bgfx,andr3wmac/bgfx,mendsley/bgfx,elmindreda/bgfx,ktotheoz/bgfx,bkaradzic/bgfx,LSBOSS/bgfx,ming4883/bgfx,kondrak/bgfx