This function allows you to delete chat tag.
Request GET: https://wamm.chat/api2/contact_tag_delete/token/phone/tag-name
Encode the tag name before sending with a function like urlencode.
Successful response: JSON:
[err] => 0
[result] => success
Error response: JSON: {"err":"phone fail"}
Error options:
- token fail - error in token
- not found - chat not found
- phone fail - error in phone number
- tag not entry - empty tag value