patch 8.0.0784: job of terminal may be garbage collected

Problem:    Job of terminal may be garbage collected.
Solution:   Set copyID on job in terminal. (Ozaki Kiichi)
diff --git a/src/version.c b/src/version.c
index 1b13fd3..43ea98a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    784,
+/**/
     783,
 /**/
     782,