patch 8.2.3727: in a gnome terminal keys are recognized as mouse events

Problem:    In a gnome terminal keys are recognized as mouse events.
Solution:   Only recognize DEC mouse events when four numbers are following.
            (closes #9256)
diff --git a/src/version.c b/src/version.c
index 9423939..184b377 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3727,
+/**/
     3726,
 /**/
     3725,