patch 9.0.2132: Duplicate Netbeans Error Message

Problem:  Duplicate Netbeans Error Message
Solution: Remove duplicate message

We have 2 error Messages used for the Netbeans interface:

- EXTERN char e_invalid_buffer_identifier_in_close[]
  INIT(= N_("E648: Invalid buffer identifier in close"));
- EXTERN char e_invalid_buffer_identifier_in_close_2[]
  INIT(= N_("E649: Invalid buffer identifier in close"));

Since the error message is exactly the same, get rid of the  second
message.

closes: #13584

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/netbeans.c b/src/netbeans.c
index a27148c..ebdf3a4 100644
--- a/src/netbeans.c
+++ b/src/netbeans.c
@@ -1875,7 +1875,7 @@
 		// This message was commented out, probably because it can
 		// happen when shutting down.
 		if (p_verbose > 0)
-		    emsg(_(e_invalid_buffer_identifier_in_close_2));
+		    emsg(_(e_invalid_buffer_identifier_in_close));
 	    }
 	    nbdebug(("    CLOSE %d: %s\n", bufno, name));
 #ifdef FEAT_GUI