chore: fix test realm path

Author: n2p5

examples/gno.land/p/n2p5/mgroup/mgroup_test.gno

@@ -11,7 +11,7 @@ import (
 
 func TestManagedGroup(t *testing.T) {
 	t.Parallel()
-	testing.SetRealm(std.NewCodeRealm("gno.land/r/dev/null"))
+	testing.SetRealm(std.NewCodeRealm("gno.land/r/test/test"))
 
 	u1 := testutils.TestAddress("u1")
 	u2 := testutils.TestAddress("u2")