tests/texture: add missing uniform declarations in texture_mipmap test shader
tests/texture: add missing uniform declarations in texture_mipmap test shader

This chunk was forgotten in c16b92694fa8ef8e0f24ed39a270744c9e4e4fe2.

gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl