Handle leading spaces when matching extra alerts

It is common for users to set "foo, bar" and the leading space
has caused issues in the past so lets just ignore that.

src/common/inbound.c

@@ -237,7 +237,7 @@ alert_match_word (char *word, char *masks)
 		{
 			endchar = *p;
 			*p = 0;
-			res = match (masks, word);
+			res = match (g_strchug (masks), word);
 			*p = endchar;
 
 			if (res)