Correct 2nd Iter: Hostnames to lowercase.

As mentioned by @StevenBlack in #2400, hostnames should be
converted to lowercase.

updateHostsFile.py

@@ -1123,6 +1123,8 @@ def normalize_rule(rule, target_ip, keep_domain_comments):
             # Example: 0.0.0.0 example.org
             hostname, suffix = split_rule[-1], None
 
+        hostname = hostname.lower()
+
         if (
             is_ip(hostname)
             or re.search(static_ip_regex, hostname)
@@ -1154,6 +1156,8 @@ def normalize_rule(rule, target_ip, keep_domain_comments):
         except ValueError:
             hostname, suffix = split_rule[0], None
 
+        hostname = hostname.lower()
+
         return normalize_response(hostname, suffix)
 
     return belch_unwanted(rule)