Fix `helmfile --namespace ns delete` to not fail consistently

Until now `helmfile delete` with helm v3 had been failing when `--namespace` is provided. Helmfile was missing the fact that in helm v3 namespace must be passed instead of tiller-namespace to scope releases to be deleted.

```
err: release "b-1" failed: helm3rc2 exited with status 1:
  Error: uninstall: Release not loaded: b-1: release: not found
in ./helmfile.yaml: release "b-1" failed: helm3rc2 exited with status 1:
  Error: uninstall: Release not loaded: b-1: release: not found
```

pkg/state/state.go

@@ -1143,6 +1143,8 @@ func (st *HelmState) DeleteReleases(affectedReleases *AffectedReleases, helm hel
 			return nil
 		}
 
+		st.ApplyOverrides(&release)
+
 		flags := []string{}
 		if purge && !isHelm3() {
 			flags = append(flags, "--purge")