ash: suppress readonly1.tests false positive; add readonly0.tests

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/shell/ash_test/ash-vars/readonly1.right b/shell/ash_test/ash-vars/readonly1.right
index 2b363e3..1f5be64 100644
--- a/shell/ash_test/ash-vars/readonly1.right
+++ b/shell/ash_test/ash-vars/readonly1.right
@@ -1,2 +1,2 @@
-One:1
-One:1
+Fail:2
+Fail:2