patch 8.2.4980: when 'shortmess' contains 'A' loading session may still warn

Problem:    When 'shortmess' contains 'A' loading a session may still warn for
            an existing swap file. (Melker Österberg)
Solution:   Keep the 'A' flag to 'shortmess' in the session file.
            (closes #10443)
diff --git a/src/version.c b/src/version.c
index 37e3d80..90d9618 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4980,
+/**/
     4979,
 /**/
     4978,