Prevent conflict between Whatsapp and Skype bridge tokens

Fixes an error like this:

> synapse.config._base.ConfigError: Cannot reuse as_token across application services

group_vars/matrix_servers

@@ -308,9 +308,9 @@ matrix_mx_puppet_skype_systemd_required_services_list: |
     (['matrix-synapse.service'] if matrix_synapse_enabled else [])
   }}
 
-matrix_mx_puppet_skype_appservice_token: "{{ matrix_synapse_macaroon_secret_key | password_hash('sha512', 'whats.as.token') | to_uuid }}"
+matrix_mx_puppet_skype_appservice_token: "{{ matrix_synapse_macaroon_secret_key | password_hash('sha512', 'skype.as.tok') | to_uuid }}"
 
-matrix_mx_puppet_skype_homeserver_token: "{{ matrix_synapse_macaroon_secret_key | password_hash('sha512', 'whats.hs.token') | to_uuid }}"
+matrix_mx_puppet_skype_homeserver_token: "{{ matrix_synapse_macaroon_secret_key | password_hash('sha512', 'skype.hs.tok') | to_uuid }}"
 
 matrix_mx_puppet_skype_login_shared_secret: "{{ matrix_synapse_ext_password_provider_shared_secret_auth_shared_secret if matrix_synapse_ext_password_provider_shared_secret_auth_enabled else '' }}"