Sync Continuwuity v0.5.8 LDAP StartTLS reference options

Adds the new `use_starttls` and `disable_tls_verification` keys to
the commented-out `[global.ldap]` reference block, matching upstream.

roles/custom/matrix-continuwuity/templates/continuwuity.toml.j2

@@ -1909,6 +1909,14 @@ foci = [
 #
 #uri = ""
 
+# StartTLS for LDAP connections.
+#
+#use_starttls = false
+
+# Skip TLS certificate verification, possibly dangerous.
+#
+#disable_tls_verification = false
+
 # Root of the searches.
 #
 # example: "ou=users,dc=example,dc=org"