media: invalidate correct dive when removing picture

This fixes a bug: when deleting a picture when multiple dives
were selected, possibly the wrong dive was invalidated.
Thus, the dive wouldn't have been saved to the git repository.

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

core/dive.c

@@ -3596,7 +3596,7 @@ bool dive_remove_picture(struct dive *d, const char *filename)
 		struct picture *temp = (*picture)->next;
 		free_picture(*picture);
 		*picture = temp;
-		invalidate_dive_cache(current_dive);
+		invalidate_dive_cache(d);
 		return true;
 	}
 	return false;