Symbian's QElapsedTimer::restart() fixed to return ms rather than us

Symbian's QElapsedTimer::restart() had accidently been changed to
return a microsecond count rather than milliseconds, when the elapsed
timer resolution was increased. This fixes it back to milliseconds.

Reviewed-by: Shane Kearns
(cherry picked from commit 39202973e3fb7ff37033290b29efa1b9edc674fb)

src/corelib/tools/qelapsedtimer_symbian.cpp

@@ -95,7 +95,7 @@ qint64 QElapsedTimer::restart()
     qint64 oldt1 = t1;
     t1 = getMicrosecondFromTick();
     t2 = 0;
-    return t1 - oldt1;
+    return (t1 - oldt1) / 1000;
 }
 
 qint64 QElapsedTimer::nsecsElapsed() const