bearerpropertiestest fix QList::first() on temporary
Fix clazy issue "autotests/bearerpropertiestest.cpp:73:47: warning: Don't call QList::first() on temporary [clazy-detaching-temporary]".
Fix clazy issue "autotests/bearerpropertiestest.cpp:73:47: warning: Don't call QList::first() on temporary [clazy-detaching-temporary]".