patch 8.0.0789: splitting terminal window has resizing problems

Problem:    When splitting a terminal window where the terminal follows the
            size of the window doesn't work.
Solution:   Use the size of the smallest window. (Yasuhiro Matsumoto, closes
            #1885)

src/version.c

@@ -769,6 +769,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    789,
 /**/
     788,
 /**/