patch 9.1.0561: netbeans: variable used un-initialized (Coverity)

Problem:  netbeans: variable used un-initialized (Coverity)
          (after v9.1.0557)
Solution: properly initialize exarg_T struct for use with netbeans

The actual exarg.cmdidx doesn't really matter, but let's use something,
that is not affected by the recent changes (going through the buffer
list) and use CMD_USER.

closes: #15211

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index ddb02d1..15fc775 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    561,
+/**/
     560,
 /**/
     559,