QJniObject: fix signature of LocalFrame::newLocalRef

The implementation calls a const member function on the QJniObject
passed in, and no move happens. And the parameter is not a universal
reference either.

Found during header review.

Pick-to: 6.7
Task-number: QTBUG-119952
Change-Id: I9479df798178b089277aa230f50f4e73f38ceb2c
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
Reviewed-by: Juha Vuolle <juha.vuolle@qt.io>

src/corelib/kernel/qjniobject.h

@@ -40,7 +40,7 @@ class Q_CORE_EXPORT QJniObject
             return static_cast<T>(jniEnv()->NewLocalRef(object));
         }
         template <typename T>
-        auto newLocalRef(QJniObject &&object)
+        auto newLocalRef(const QJniObject &object)
         {
             return newLocalRef<T>(object.template object<T>());
         }