patch 8.2.1662: :mksession does not restore shared terminal buffer properly

Problem:    :mksession does not restore shared terminal buffer properly.
Solution:   Keep a hashtab with terminal buffers. (Rob Pilling, closes #6930)
diff --git a/src/version.c b/src/version.c
index 77f17f6..74ed214 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1662,
+/**/
     1661,
 /**/
     1660,