Remove faulty #include from widgets baseline test

Since there is an actual qwidgetbaselinetest.h header file, one should
not include a .moc file. The build system will take care of it, and
currently warns about this #include.

Pick-to: 6.3
Change-Id: I4fbff9ef75c901fe3db4df54d6f3ff0d9307edce
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

tests/baseline/shared/qwidgetbaselinetest.cpp

@@ -184,6 +184,4 @@ void QWidgetBaselineTest::takeStandardSnapshots()
         window->focusWidget()->clearFocus();
 }
 
-#include "qwidgetbaselinetest.moc"
-
 QT_END_NAMESPACE