...like e0c2ea6b "Consistency around
SdrMetricItem in svx/sderitm.hxx," similar to recent
c3a9a954 "that's not right anyway, using the
Distance as a which-id."

Should all be found and fixed now with the removal of the unnecessary but
harmful default value from the two-argument SdrMetricItem ctor.

Change-Id: I6eaeb6633c9a350b18e02d476d2c8794a733cea8