Fix: heron.cgi force 2D on 3D input files

[justb4]

Fix from @deduikertjes

"Het uploaden van een shapefile mislukt indien het een 3D shapefile betreft *
*Dit is makkelijk te fixen door in ogr2ogr te specificeren dat er overgegaan moet worden op 2D."

Sponsored by LBP|SIGHT

def ogr2ogr(out_file, in_file, target_format, assign_srs=None, source_srs=None, target_srs=None):
    try:

        # Entire ogr2ogr command line
        # Make ogr2ogr command line, use separator | to deal with quotes etc.
       cmd_tmpl = OGR2OGR_PROG

       # Force 2D otherwise failure with 3D input file
       cmd_tmpl += '|-dim|2'

[justb4]

fixed