Fix tst_QTimer runtime warnings

********* Start testing of tst_QTimer *********

Config: Using QtTest library 5.9.3, Qt 5.9.3 (x86_64-little_endian-lp64 shared (dynamic) debug build; by GCC 6.3.0 20170406)

PASS : tst_QTimer::initTestCase()

QWARN : tst_QTimer::moveToThread() QObject::killTimer: Timers cannot be stopped from another thread

QWARN : tst_QTimer::moveToThread() QObject::~QObject: Timers cannot be stopped from another thread

PASS : tst_QTimer::moveToThread()

PASS : tst_QTimer::cleanupTestCase()

Totals: 3 passed, 0 failed, 0 skipped, 0 blacklisted, 302ms

********* Finished testing of tst_QTimer *********