fix issue with previous run data not being cleaned up

[cseppan]

From Alison Eyth:

We found that it seems some intermediate data from an earlier run of some surrogates was merged with the updated data in the new run.

We believe that the printf statement on line 22 of template_polygon_withFF_noWA.csh needs to append (>>) rather than replace (>).

Noting that when a surrogate is run, DROP TABLE command(s) should be issued to remove any old tables – most of the other scripts seem to do this, but not this one.