mobile/dive-list: only show dive list notifications when it is visible

Without this check we'll show the 'Please tap the plus botton...'
notification during app initialization as we are showing the initial set
of messages - which makes no sense.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

mobile-widgets/qml/DiveList.qml

@@ -445,7 +445,10 @@ Kirigami.ScrollablePage {
 		Component.onCompleted: {
 			manager.appendTextToLog("finished setting up the diveListView")
 		}
-		onVisibleChanged: setupActions()
+		onVisibleChanged: {
+			if (visible)
+				setupActions()
+		}
 	}
 
 	property QtObject downloadFromDCAction: Kirigami.Action {