patch 8.2.0149: maintaining a Vim9 branch separately is more work

Problem:    Maintaining a Vim9 branch separately is more work.
Solution:   Merge the Vim9 script changes.
diff --git a/src/session.c b/src/session.c
index 418fcba..5bebb05 100644
--- a/src/session.c
+++ b/src/session.c
@@ -980,7 +980,7 @@
     fname = get_view_file(*eap->arg);
     if (fname != NULL)
     {
-	do_source(fname, FALSE, DOSO_NONE);
+	do_source(fname, FALSE, DOSO_NONE, NULL);
 	vim_free(fname);
     }
 }