Fix issue with the use of segmentation with TC frames (wrong sequence flag)

(cherry picked from commit 4ba2efc)

Author: dariol83

eu.dariolucia.ccsds.tmtc/src/main/java/eu/dariolucia/ccsds/tmtc/datalink/pdu/TcTransferFrame.java

@@ -134,14 +134,14 @@ public enum ControlCommandType {
      * The meaning of the sequence flag in case of TC segment service.
      */
     public enum SequenceFlagType {
-        /**
-         * First block
-         */
-        FIRST,
         /**
          * Continuation block
          */
         CONTINUE,
+        /**
+         * First block
+         */
+        FIRST,
         /**
          * Last block
          */