Register shared-secret-auth password provider first

For people using multiple password providers, it makes sense
to have the fastest one (which doesn't make network requests) be first.

roles/matrix-server/templates/synapse/homeserver.yaml.j2

@@ -630,6 +630,11 @@ email:
 #         #filter: "(objectClass=posixAccount)"
 {% if matrix_synapse_password_providers_enabled %}
 password_providers:
+{% if matrix_synapse_ext_password_provider_shared_secret_auth_enabled %}
+  - module: "shared_secret_authenticator.SharedSecretAuthenticator"
+    config:
+      sharedSecret: "{{ matrix_synapse_ext_password_provider_shared_secret_auth_shared_secret }}"
+{% endif %}
 {% if matrix_synapse_ext_password_provider_rest_auth_enabled %}
   - module: "rest_auth_provider.RestAuthProvider"
     config:
@@ -644,11 +649,6 @@ password_providers:
           profile:
             name: {{ matrix_synapse_ext_password_provider_rest_auth_login_profile_name_autofill }}
 {% endif %}
-{% if matrix_synapse_ext_password_provider_shared_secret_auth_enabled %}
-  - module: "shared_secret_authenticator.SharedSecretAuthenticator"
-    config:
-      sharedSecret: "{{ matrix_synapse_ext_password_provider_shared_secret_auth_shared_secret }}"
-{% endif %}
 {% if matrix_synapse_ext_password_provider_ldap_enabled %}
   - module: "ldap_auth_provider.LdapAuthProvider"
     config: