Fix WebGL clearDepth signature

Author: mseddon

src/main/scala/org/scalajs/dom/raw/WebGL.scala

@@ -1012,7 +1012,7 @@ class WebGLRenderingContext extends js.Object {
  /**
  * Sets the clear depth to use with [[WebGLRenderingContext#clear]].
  */
- def clearDepth(depth: Int): Unit = js.native
+ def clearDepth(depth: Double): Unit = js.native
 
  /**
  * Sets the stencil value to use with [[WebGLRenderingContext#clear]].