chore: remove change to app done during testing

Author: brandyscarney

core/api.txt

@@ -179,7 +179,7 @@ ion-alert,css-prop,--width,ionic
 ion-alert,css-prop,--width,ios
 ion-alert,css-prop,--width,md
 
-ion-app,shadow
+ion-app,none
 ion-app,prop,mode,"ios" | "md",undefined,false,false
 ion-app,prop,theme,"ios" | "md" | "ionic",undefined,false,false
 ion-app,method,setFocus,setFocus(elements: HTMLElement[]) => Promise<void>