entrypoint: Fix type of LDAP_SYNCHRONIZED_GROUPS_BY_REALM.

This variable value needs to be a complex array, so it needs the same
exemption as some other variables in `entrypoint.sh`.

Co-authored-by: Isaac van Bakel <[email protected]>

Author: ivanbakel

entrypoint.sh

@@ -278,6 +278,7 @@ zulipConfiguration() {
            [ "$setting_key" = "AUTH_LDAP_USER_FLAGS_BY_GROUP" ] || \
            [ "$setting_key" = "AUTH_LDAP_GROUP_TYPE" ] || \
            [ "$setting_key" = "AUTH_LDAP_ADVANCED_REALM_ACCESS_CONTROL" ] || \
+           [ "$setting_key" = "LDAP_SYNCHRONIZED_GROUPS_BY_REALM" ] || \
            [ "$setting_key" = "SOCIAL_AUTH_OIDC_ENABLED_IDPS" ] || \
            [ "$setting_key" = "SOCIAL_AUTH_SAML_ENABLED_IDPS" ] || \
            [ "$setting_key" = "SOCIAL_AUTH_SAML_ORG_INFO" ] || \