virglrenderer uses wrong lod channel for TXQ

It appears the LOD lookup is done with:

   /* No LOD for these texture types, but on GLES we emulate RECT by using
    * a normal 2D texture, so we have to give LOD 0 */
   switch (inst->Texture.Texture) {
   case TGSI_TEXTURE_RECT:
   case TGSI_TEXTURE_SHADOWRECT:
      if (ctx->cfg->use_gles) {
         snprintf(bias, 128, ", 0");
         break;
      }
      /* fallthrough */
   case TGSI_TEXTURE_BUFFER:
   case TGSI_TEXTURE_2D_MSAA:
   case TGSI_TEXTURE_2D_ARRAY_MSAA:
      break;
   default:
      snprintf(bias, 128, ", int(%s.w)", srcs[0]);
   }

but TGSI docs say LOD is src0.x.