patch 8.2.1811: mapping Ctrl-key does not work for '{', '}' and '|'

Problem:    Mapping Ctrl-key does not work for '{', '}' and '|'.
Solution:   Remove the shift modifier. (closes #6457)
diff --git a/src/version.c b/src/version.c
index 140b3c8..a2929bc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1811,
+/**/
     1810,
 /**/
     1809,