Fix STATS output for config-based spamfilters with reasons with spaces.

For config-based spamfilters, the reason was not escaped, meaning that
spaces and underscores did not work as expected.
For example, in "STATS spamfilter" the spaces were displayed as-is
which means that the numeric output was not really parsable.

Apparently this bug exists since UnrealIRCd 5 already...

src/modules/tkl.c

@@ -638,6 +638,7 @@ int tkl_config_run_spamfilter(ConfigFile *cf, ConfigEntry *ce, int type)
 	if (match)
 		m = unreal_create_match(match_type, match, NULL);
 
+	banreason = unreal_encodespace(banreason);
 	tkl_add_spamfilter(TKL_SPAMF,
 	                   id,
 	                   target,