[fenix] For https://github.com/mozilla-mobile/fenix/issues/3496: dismiss share fragment when clicking outside content (https://github.com/mozilla-mobile/fenix/pull/3513)

* dismiss share fragment when clicking outside content

* add logic in view layer

app/src/main/java/org/mozilla/fenix/share/ShareUIView.kt

@@ -50,6 +50,7 @@ class ShareUIView(
             account_header.visibility = View.GONE
         }
 
+        container.setOnClickListener { actionEmitter.onNext(ShareAction.Close) }
         close_button.setOnClickListener { actionEmitter.onNext(ShareAction.Close) }
     }