cleanup: remove unused roles in DiveTripModelBase

The roles DIVE_IDX and SELECTED_ROLE were used for the old selection
system and removed in b8e7a600d2d2a30f7e0646fc164ab6e57fd4782f.

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

qt-models/divetripmodel.cpp

@@ -389,10 +389,6 @@ QVariant DiveTripModelBase::diveData(const struct dive *d, int column, int role)
 		return d->rating;
 	case DIVE_ROLE:
 		return QVariant::fromValue(const_cast<dive *>(d));  // Not nice: casting away a const
-	case DIVE_IDX:
-		return get_divenr(d);
-	case SELECTED_ROLE:
-		return d->selected;
 	case CURRENT_ROLE:
 		return d == current_dive;
 	}

qt-models/divetripmodel.h

@@ -53,8 +53,6 @@ public:
 		IS_TRIP_ROLE,
 		DIVE_ROLE,
 		TRIP_ROLE,
-		DIVE_IDX,
-		SELECTED_ROLE,
 		CURRENT_ROLE,
 		TRIP_HAS_CURRENT_ROLE, // Returns true if this is a trip and it contains the current dive
 		LAST_ROLE