ftp: register ftp.command buffer at request completion

Register ftp.command with the FTP request completion progress so it can
be used by firewall rules on the ftp:request_complete hook.

Ticket: #8392
(cherry picked from commit bf63c574d3)

src/detect-ftp-command.c

@@ -83,8 +83,8 @@ void DetectFtpCommandRegister(void)
     sigmatch_table[DETECT_FTP_COMMAND].Setup = DetectFtpCommandSetup;
     sigmatch_table[DETECT_FTP_COMMAND].flags |= SIGMATCH_NOOPT;
 
-    g_ftp_cmd_buffer_id = SCDetectHelperBufferMpmRegister(
-            BUFFER_NAME, BUFFER_DESC, ALPROTO_FTP, STREAM_TOSERVER, DetectFTPCommandGetData);
+    g_ftp_cmd_buffer_id = SCDetectHelperBufferProgressMpmRegister(BUFFER_NAME, BUFFER_DESC,
+            ALPROTO_FTP, STREAM_TOSERVER, DetectFTPCommandGetData, FTP_STATE_FINISHED);
 
     SCLogDebug("registering " BUFFER_NAME " rule option");
 }