patch 9.0.1026: type of w_last_topfill is wrong

Problem:    type of w_last_topfill is wrong.
Solution:   Use "int" instead of "linenr_T". (closes #11670)
diff --git a/src/version.c b/src/version.c
index d29b3cb..e65729f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1026,
+/**/
     1025,
 /**/
     1024,