patch 8.2.3121: 'listchars' "exceeds" character appears in foldcolumn

Problem:    'listchars' "exceeds" character appears in foldcolumn. Window
            separator is missing. (Leonid V.  Fedorenchik)
Solution:   Only draw the "exceeds" character in the text area.  Break the
            loop when not drawing the text. (closes #8524)
diff --git a/src/version.c b/src/version.c
index 39edf55..fc65ac0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3121,
+/**/
     3120,
 /**/
     3119,