patch 8.2.1647: Vim9: result of expression with && and || is not a bool

Problem:    Vim9: result of expression with && and || cannot be assigned to a
            bool variable.
Solution:   Add the TTFLAG_BOOL_OK flag and convert the value if needed.
diff --git a/src/version.c b/src/version.c
index 81df0bb..5cb8df0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1647,
+/**/
     1646,
 /**/
     1645,