fix(ui5-dialog): fix behaviour on mobile when added to DOM on interaction (#1830)

Author: fifoosid

packages/main/src/Dialog.js

@@ -83,7 +83,9 @@ class Dialog extends Popup {
 
 	constructor() {
 		super();
+	}
 
+	onBeforeRendering() {
 		this.onPhone = isPhone();
 	}