`Location#origin` should return a `String`

There's a reason it doesn't, but it's not a particularly good one.

scala-js-dom/dom/src/main/scala/org/scalajs/dom/Location.scala

Lines 47 to 49 in 410f439

    
               * This property also does not exist consistently on IE, even as new as IE11, hence it must be UndefOr. 
        
               */ 
        
             def origin: js.UndefOr[String] = js.native

https://developer.mozilla.org/en-US/docs/Web/API/Location/origin#browser_compatibility

Oh and also this flag parameter is not part of the spec, just a firefox thing ...

scala-js-dom/dom/src/main/scala/org/scalajs/dom/Location.scala

Line 55 in 410f439

def reload(flag: Boolean = js.native): Unit = js.native

	* This property also does not exist consistently on IE, even as new as IE11, hence it must be UndefOr.
	*/
	def origin: js.UndefOr[String] = js.native