Update HMPO live chat form to new URL

As requested by HMPO, this commit changes the old provider URL to
the new provider, for both the chat itself and the availablity URL.

Also removes unusred URLs that are no longer required.

Author: Tetrino

lib/webchat.yaml

@@ -1,12 +1,4 @@
-- base_path: /government/organisations/hm-passport-office/contact/passport-advice-and-complaints
-  open_url: https://hmpowebchat.klick2contact.com/v03/launcherV3.php?p=HMPO&d=717&ch=CH&psk=chat_a1&iid=STC&srbp=0&fcl=0&r=Chat&s=https://hmpowebchat.klick2contact.com/v03&u=&wo=&uh=&pid=2&iif=0
-  availability_url: https://hmpowebchat.klick2contact.com/v03/providers/HMPO/api/availability.php
-  open_url_redirect: false
-- base_path: /government/organisations/hm-passport-office/contact/webchat
-  open_url: https://hmpowebchat.klick2contact.com/v03/launcherV3.php?p=HMPO&d=717&ch=CH&psk=chat_a1&iid=STC&srbp=0&fcl=0&r=Chat&s=https://hmpowebchat.klick2contact.com/v03&u=&wo=&uh=&pid=2&iif=0
-  availability_url: https://hmpowebchat.klick2contact.com/v03/providers/HMPO/api/availability.php
-  open_url_redirect: false
 - base_path: /government/organisations/hm-passport-office/contact/hm-passport-office-webchat
-  open_url: https://hmpowebchat.klick2contact.com/v03/launcherV3.php?p=HMPO&d=717&ch=CH&psk=chat_a1&iid=STC&srbp=0&fcl=0&r=Chat&s=https://hmpowebchat.klick2contact.com/v03&u=&wo=&uh=&pid=2&iif=0
-  availability_url: https://hmpowebchat.klick2contact.com/v03/providers/HMPO/api/availability.php
+  open_url: https://omni.eckoh.uk/v03.5/launcherV3.php?p=HMPO&d=717&ch=CH&psk=chat_a1&iid=STC&srbp=0&fcl=0&r=Chat&s=https://omni.eckoh.uk/v03.5&u=&wo=&uh=&pid=2&iif=0
+  availability_url: https://omni.eckoh.uk/v03.5/providers/HMPO/api/availability.php
   open_url_redirect: false