Fix incorrect usage of rewrite rule function

mapserver/site-conf

@@ -41,7 +41,7 @@
         #RewriteRule   "^/fwms/([^/]+)?(.*)" "/cgi-bin/mapserv.fcgi?map=/work/mapfiles/$1.map&$2" [PT,QSA]
         # /wms_times/g16/abi/radf/true_color
         # LAYER_BASE_DIR defaults to /data/tiles
-        RewriteRule   "^/wms_times_postgres/([^/]+)/([^/]+)/([^/]+)/([^/]+)" "/cgi-bin/layer_times_postgres.py?layer=$1_$2_$3_l1b_${lc:4}" [PT,QSA]
+        RewriteRule   "^/wms_times_postgres/([^/]+)/([^/]+)/([^/]+)/([^/]+)" "/cgi-bin/layer_times_postgres.py?layer=$1_$2_$3_l1b_${lc:$4}" [PT,QSA]
         RewriteRule   "^/wms_times_shapes/([^/]+)/([^/]+)/([^/]+)/([^/]+)" "/cgi-bin/layer_times.py?layer=__LAYER_BASE_DIR__/$1/$2/$3/$4/$4.shp" [PT,QSA]
         # Regular CGI version of the URL (put last since it should be used less often)
         RewriteRule   "^/wms_cgi/([^/]+)/([^/]+)/([^/]+)/([^/]+)?(.*)" "/cgi-bin/mapserv?map=/work/mapfiles/$1_$2_$3_$4.map&$5" [PT,QSA]