profile: connect to DivePointsPlannerModel in separate function

The connection to the DivePointsPlannerModel was done in two
distinct functions: setAddState() and setPlanState(), which
means that these could easily get out-of-sync. Factor this out
into a single function.

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

profile-widget/profilewidget2.h

@@ -256,6 +256,7 @@ private:
 	std::vector<std::unique_ptr<DiveHandler>> handles;
 	int handleIndex(const DiveHandler *h) const;
 #ifndef SUBSURFACE_MOBILE
+	void connectPlannerModel();
 	void repositionDiveHandlers();
 	int fixHandlerIndex(DiveHandler *activeHandler);
 	DiveHandler *createHandle();