fix update bug when compressed texture create with BGFX_TEXTURE_SRGB (#2437)
fix update bug when compressed texture create with BGFX_TEXTURE_SRGB (#2437)

Co-authored-by: chenmou.cm <0730d49f5dd208ff2a4bad8b26801ca68fabec38@alibaba-inc.com>
bkaradzic/bgfx,emoon/bgfx,bkaradzic/bgfx,jdryg/bgfx,emoon/bgfx,bkaradzic/bgfx,LWJGL-CI/bgfx,emoon/bgfx,LWJGL-CI/bgfx,LWJGL-CI/bgfx,jdryg/bgfx,jdryg/bgfx,bkaradzic/bgfx,jdryg/bgfx,LWJGL-CI/bgfx