patch 8.0.1756: GUI: after prompting for a number the mouse shape is wrong

Problem:    GUI: after prompting for a number the mouse shape is sometimes
            wrong.
Solution:   Call setmouse() after setting "State". (Hirohito Higashi,
            closes #2709)
diff --git a/src/version.c b/src/version.c
index 5b41568..0960c91 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1756,
+/**/
     1755,
 /**/
     1754,