patch 9.0.1312: Cursor position wrong when splitting window in insert mode

Problem:    Cursor position wrong when splitting window in insert mode.
Solution:   Pass the actual mode to win_fix_cursor(). (Luuk van Baal,
            closes #11999,
diff --git a/src/version.c b/src/version.c
index c59a3a1..080c3ad 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1312,
+/**/
     1311,
 /**/
     1310,