patch 8.2.1798: Vim9: trinary operator condition is too permissive

Problem:    Vim9: trinary operator condition is too permissive.
Solution:   Use tv_get_bool_chk().

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1798,
 /**/
     1797,
 /**/