misc: cleanup QML import modules

src/mainview/components/CallOverlay.qml

src/mainview/components/CallStackView.qml

src/mainview/components/CallViewContextMenu.qml

src/mainview/components/ContactPicker.qml

src/mainview/components/ContactPickerItemDelegate.qml

src/mainview/components/ContactSearchBar.qml

src/mainview/components/ConversationListView.qml

src/mainview/components/ConversationSmartListContextMenu.qml

src/mainview/components/FilesToSendContainer.qml

src/mainview/components/FilesToSendDelegate.qml

src/mainview/components/InitialCallPage.qml

src/mainview/components/InvitationView.qml

src/mainview/components/MainOverlay.qml

src/mainview/components/MessageBar.qml

src/mainview/components/MessageWebViewFooter.qml

src/mainview/components/MessageWebViewHeader.qml

src/mainview/components/OngoingCallPage.qml

src/mainview/components/ParticipantCallInStatusDelegate.qml

src/mainview/components/ParticipantCallInStatusView.qml

src/mainview/components/ParticipantControlLayout.qml