AK: Use StringView as key-type when removing a Value from an JsonObject

Author: https://github.com/Hendiadyoin1
Commit: b39c4c62d0
Pull-request: https://github.com/SerenityOS/serenity/pull/11268
Reviewed-by: https://github.com/alimpfard

AK/JsonObject.h

@@ -142,7 +142,7 @@ public:
             callback(member.key, member.value);
     }
 
-    bool remove(String const& key)
+    bool remove(StringView key)
     {
         return m_members.remove(key);
     }