* fix(templates/kubit): logic inversion on kubitSingleNamespace

Prior to this PR setting `Values.kubitSingleNamespace` to `false` would
cause it to watch only a single namespace, which seems to be the `kubit`
namespace itself. The reason it ends up watching the `kubit` namespace
can be seen in the deployment's namespace setting:

```
  namespace: {{if .Values.kubitSingleNamespace}}{{.Values.namespaceOverride | default .Release.Namespace}}{{else}}kubit{{end}}
```