Mobile: Don't access dive-id via DiveObjectHelper

There is already a role to do that. Query the model directly to
avoid creating a full DiveHelperObject.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

mobile-widgets/qml/DiveDetailsView.qml

@@ -397,7 +397,7 @@ Item {
 		}
 		Component.onCompleted: {
 			qmlProfile.setMargin(Kirigami.Units.smallSpacing)
-			qmlProfile.diveId = model.dive.id;
+			qmlProfile.diveId = model.id;
 			qmlProfile.update();
 		}
 	}