GUACAMOLE-1239: Add case-sensitivity configuration for UserGroup objects and remove per-extension configuration.

extensions/guacamole-auth-ldap/src/main/java/org/apache/guacamole/auth/ldap/conf/JacksonLDAPConfiguration.java

@@ -203,13 +203,6 @@ public class JacksonLDAPConfiguration implements LDAPConfiguration {
      */
     @JsonProperty("member-attribute-type")
     private String memberAttributeType;
-    
-    /**
-     * The raw YAML value of {@link LDAPGuacamoleProperties#LDAP_USERNAMES_CASE_SENSITIVE}.
-     * If not set within the YAML, this will currently default to true.
-     */
-    @JsonProperty("case-sensitive-usernames")
-    private String caseSensitiveUsernames;
 
     /**
      * The default configuration options for all parameters.