misc: bump QML modules versions to x.15

src/mainview/MainView.qml

src/mainview/components/AboutPopUp.qml

src/mainview/components/AccountComboBox.qml

src/mainview/components/AccountComboBoxPopup.qml

src/mainview/components/AccountItemDelegate.qml

src/mainview/components/BadgeNotifier.qml

src/mainview/components/CallActionBar.qml

src/mainview/components/CallButtonDelegate.qml

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/ConversationAvatar.qml

src/mainview/components/ConversationListView.qml

src/mainview/components/ConversationSmartListContextMenu.qml

src/mainview/components/FilesToSendContainer.qml

src/mainview/components/FilesToSendDelegate.qml

src/mainview/components/FilterTabButton.qml