Fix repairing geometries ST_Transform() and ST_MakeValid() can both collapse geometries to a lower dimension than polygonal and the output of ST_Transform() can be invalid geometries. Respect that in the order in which functions are stacked here.

teichmann@intevation.de = sascha.teichmann@intevation.de
bernhard.reiter@intevation.de = bernhard@intevation.de