Comply with go regexp & user defined regular expression prefix (#164)

To avoid further confusion like this: https://github.com/v2fly/domain-list-community/issues/163

data/ookla-speedtest-ads

@@ -1 +1 @@
-regex:^speed\.(coe|open)\.ad\.[a-z]{2,6}\.prod\.hosts\.ooklaserver\.net$ @ads
+regexp:^speed\.(coe|open)\.ad\.[a-z]{2,6}\.prod\.hosts\.ooklaserver\.net$ @ads