patch 8.1.1759: no mode char for terminal mapping from maparg()

Problem:    No mode char for terminal mapping from maparg().
Solution:   Check for TERMINAL mode. (closes #4735)
diff --git a/src/version.c b/src/version.c
index 209f3c9..2aedc6a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1759,
+/**/
     1758,
 /**/
     1757,