patch 8.0.0892: when opening a terminal the pty size doesn't always match

Problem:    When opening a terminal the pty size doesn't always match.
Solution:   Update the pty size after opening the terminal. (Ken Takata)

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    892,
 /**/
     891,
 /**/