message: fix debug checks for compressed textures
  Fixes
diff: @@ -1938,8 +1938,8 @@ void OpenGLDriver::setCompressedTextureData(GLTexture* t, uint32_t level,
  DEBUG_MARKER()
  auto& gl = mContext;
  - assert_invariant(xoffset + width <= t->width >> level);
  - assert_invariant(yoffset + height <= t->height >> level);
  + assert_invariant(xoffset + width <= std::max(1u, t->width >> level));
  + assert_invariant(yoffset + height <= std::max(1u, t->height >> level));
  assert_invariant(zoffset + depth <= t->depth);
  assert_invariant(t->samples <= 1);
  