* #15503: update copyright for daemon/test

daemon/test/accounttest.cpp

daemon/test/accounttest.h

daemon/test/audiolayertest.cpp

daemon/test/audiolayertest.h

daemon/test/configurationtest.cpp

daemon/test/configurationtest.h

daemon/test/constants.h

daemon/test/delaydetectiontest.cpp

daemon/test/delaydetectiontest.h

daemon/test/gaincontroltest.cpp

daemon/test/gaincontroltest.h

daemon/test/historytest.cpp

daemon/test/historytest.h

daemon/test/instantmessagingtest.cpp

daemon/test/instantmessagingtest.h

daemon/test/main.cpp

daemon/test/mainbuffertest.cpp

daemon/test/mainbuffertest.h

daemon/test/numbercleanertest.cpp

daemon/test/numbercleanertest.h