r.buffer.lowmem: reflect change in r.category input separator handling (separator option is used, so it need to be specified for :, https://trac.osgeo.org/grass/changeset/58811)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@58812 15284696-431f-4ddb-bdfa-cd5b030d7da7

scripts/r.buffer.lowmem/r.buffer.lowmem.py

@@ -115,7 +115,8 @@ def main():
     grass.message(_("Extracting buffers (2/2)..."))
     grass.mapcalc(exp, output = output, input = temp_src, dist = temp_dist)
 
-    p = grass.feed_command('r.category', map = output, rules = '-')
+    p = grass.feed_command('r.category', map = output,
+                           separator=':', rules = '-')
     p.stdin.write("1:distances calculated from these locations\n")
     d0 = "0"
     for n, d in enumerate(distances):