patch 8.1.1262: cannot simulate a mouse click in a test

Problem:    Cannot simulate a mouse click in a test.
Solution:   Add test_setmouse().
diff --git a/src/version.c b/src/version.c
index d78ef3d..07f3962 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1262,
+/**/
     1261,
 /**/
     1260,