misc: Update copyright years to 2023

src/app/jamiavatartheme.h

src/app/lrcinstance.cpp

src/app/lrcinstance.h

src/app/main.cpp

src/app/mainapplication.cpp

src/app/mainapplication.h

src/app/mainview/MainView.qml

src/app/mainview/components/AboutPopUp.qml

src/app/mainview/components/AccountComboBox.qml

src/app/mainview/components/AccountComboBoxPopup.qml

src/app/mainview/components/AccountItemDelegate.qml

src/app/mainview/components/AddMemberPanel.qml

src/app/mainview/components/BackupTipBox.qml

src/app/mainview/components/BadgeNotifier.qml

src/app/mainview/components/CallActionBar.qml

src/app/mainview/components/CallButtonDelegate.qml

src/app/mainview/components/CallInformationOverlay.qml

src/app/mainview/components/CallOverlay.qml

src/app/mainview/components/CallStackView.qml

src/app/mainview/components/CallViewContextMenu.qml