webgl: Fix texturing

These two tiny changes were making WebGL textures not work.

It was not seen in our texturing test since we render to a texture by
default, and that texture was bound to `gl::TEXTURE_2D`.

components/script/dom/webgltexture.rs

@@ -70,7 +70,7 @@ impl WebGLTexture {
             self.target.set(Some(target));
         }
 
-        self.renderer.send(CanvasMsg::WebGL(CanvasWebGLMsg::BindTexture(self.id, target))).unwrap();
+        self.renderer.send(CanvasMsg::WebGL(CanvasWebGLMsg::BindTexture(target, self.id))).unwrap();
 
         Ok(())
     }