Fix whitelisting issue when RAW list are given.

This patch fixes #1687.

Indeed, before this patch, the whitelisting of a RAW/Plain list of domain
was overlooked.

updateHostsFile.py

@@ -955,7 +955,7 @@ def remove_dups_and_excl(merge_file, exclusion_regexes, output_file=None):
         )
 
         for exclude in exclusions:
-            if re.search(r"[\s\.]" + re.escape(exclude) + r"\s", line):
+            if re.search(r"(^|[\s\.])" + re.escape(exclude) + r"\s", line):
                 write_line = False
                 break