avatar: save the original source of the avatar instead of the cropped

src/accountadapter.cpp

src/accountadapter.h

src/avadapter.cpp

src/avatarimageprovider.h

src/commoncomponents/AvatarImage.qml

src/commoncomponents/PhotoboothView.qml

src/messagesadapter.cpp

src/previewrenderer.cpp

src/previewrenderer.h

src/settingsadapter.cpp

src/settingsadapter.h

src/utils.cpp

src/utils.h

src/wizardview/WizardView.qml

src/wizardview/components/ProfilePage.qml