Fix texture uniform setting in Shader.

This call was crashing with the more explicit location wrappers,
as the location hadn't actually been created yet.
The call isn't necessary, as uniforms are set before rendering.

src/gameobjects/shader/Shader.js

@@ -959,8 +959,6 @@ var Shader = new Class({
 
         this.renderer.setProgram(this.program);
 
-        gl.uniform1i(uniform.uniformLocation.webGLUniformLocation, this._textureCount);
-
         this._textureCount++;
     },