QPopupEdit.json update for API Docs (#7633)

`before-show` and `before-hide` events are shown to emit native js event in the docs when it does not.

Author: metalsadman

ui/src/components/popup-edit/QPopupEdit.json

@@ -244,7 +244,6 @@
     },
 
     "before-show": {
-      "extends": "before-show",
       "desc": "Emitted right before Popup gets shown"
     },
 
@@ -253,7 +252,6 @@
     },
 
     "before-hide": {
-      "extends": "before-hide",
       "desc": "Emitted right before Popup gets dismissed"
     },