patch 8.2.5106: default cmdwin mappings are re-mappable

Problem:    Default cmdwin mappings are re-mappable.
Solution:   Make the default mappings not re-mappable. (closes #10580)  Use
            symbols for the first do_map() argument.
diff --git a/src/version.c b/src/version.c
index 4672f0e..c258263 100644
--- a/src/version.c
+++ b/src/version.c
@@ -735,6 +735,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    5106,
+/**/
     5105,
 /**/
     5104,