fix incorrect diff deletion line in split uniforms example (#214)

Author: citizinf

webgpu/lessons/webgpu-uniforms.md

@@ -467,8 +467,7 @@ When we need 2 uniform buffers per thing we want to draw
       uniformValues.set([rand(), rand(), rand(), 1], kColorOffset);        // set the color
       uniformValues.set([rand(-0.9, 0.9), rand(-0.9, 0.9)], kOffsetOffset);      // set the offset
 
-      // copy these values to the GPU
--      device.queue.writeBuffer(uniformBuffer, 0, uniformValues);
++     // copy these values to the GPU
 +      device.queue.writeBuffer(staticUniformBuffer, 0, uniformValues);
     }