patch 8.1.1703: breaking out of loop by checking window pointer insufficient

Problem:    Breaking out of loop by checking window pointer is insufficient.
Solution:   Check the window ID and the buffer number. (closes #4683)

src/version.c

@@ -777,6 +777,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1703,
 /**/
     1702,
 /**/