Use hex colors in overlastgebieden.map

Purely code cosmetics. No more bit fiddling in the generating script,
and we use hex colors elsewhere. They're arguably easier to read for web
designers.

gen_overlastgebieden.py

@@ -34,8 +34,6 @@
             q("ows_abstract", "Overlastgebieden")
 
     for name, basename, color in layers:
-        color = f"{(color>>16) & 0xff} {(color>>8) & 0xff} {color & 0xff}"
-
         with block("LAYER"):
             p("NAME", name)
             p("GROUP", "overlastgebieden")
@@ -59,15 +57,14 @@
                 p("NAME", name.replace("-", "_").title().replace("_", ""))
                 with block("STYLE"):
                     p("ANTIALIAS true")
-                    p(f"COLOR {color}")
+                    p(f'COLOR "#{color:06x}"')
                     p("OPACITY 20")
                 with block("STYLE"):
-                    p(f"OUTLINECOLOR {color}")
+                    p(f'OUTLINECOLOR "#{color:06x}"')
                     p("WIDTH 2")
 
     for name, basename, color in layers:
         name += "_label"
-        color = f"{(color>>16) & 0xff} {(color>>8) & 0xff} {color & 0xff}"
 
         with block("LAYER"):
             p("NAME", name)
@@ -104,7 +101,7 @@
                         if minscale is not None:
                             p("MINSCALEDENOM", minscale)
                         p("MAXSCALEDENOM", maxscale)
-                        p(f"COLOR {color}")
+                        p(f'COLOR "#{color:06x}"')
                         p("OUTLINECOLOR 255 255 255")
                         p("OUTLINEWIDTH 1")
                         p("FONT", "Ubuntu-M")