patch 8.1.1657: Terminal: screen updates from 'balloonexpr' are not displayed

Problem:    Terminal: screen updates from 'balloonexpr' are not displayed.
Solution:   Update the screen if needed.  Fix the word position for
            "mousemoved".
diff --git a/src/version.c b/src/version.c
index c58cbc5..fb21f07 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1657,
+/**/
     1656,
 /**/
     1655,