patch 8.2.1472: ":argdel" does not work like ":.argdel" as documented

Problem:    ":argdel" does not work like ":.argdel" as documented. (Alexey
            Demin)
Solution:   Make ":argdel" work like ":.argdel". (closes #6727)
            Also fix giving the error "0 more files to edit".
diff --git a/src/version.c b/src/version.c
index 7e660d8..92649a3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1472,
+/**/
     1471,
 /**/
     1470,