LibWeb: Stub Text.wholeText

Author: https://github.com/jamierocks
Commit: 0961d68ebc
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/682
Reviewed-by: https://github.com/tcl3 ✅

Userland/Libraries/LibWeb/DOM/Text.idl

@@ -8,7 +8,7 @@ interface Text : CharacterData {
     constructor(optional DOMString data = "");
 
     [NewObject] Text splitText(unsigned long offset);
-
+    [FIXME] readonly attribute DOMString wholeText;
 };
 
 Text includes Slottable;