Revert changing RB's namespace to required

Signed-off-by: Sebastian Malton <sebastian@malton.name>

src/renderer/api/endpoints/role-binding.api.ts

@@ -29,7 +29,7 @@ export type RoleBindingSubjectKind = "Group" | "ServiceAccount" | "User";
 export interface RoleBindingSubject {
   kind: RoleBindingSubjectKind;
   name: string;
-  namespace: string;
+  namespace?: string;
   apiGroup?: string;
 }
 

src/renderer/components/+user-management/+role-bindings/view.tsx

@@ -75,7 +75,7 @@ export class RoleBindings extends React.Component<Props> {
           renderTableContents={(binding: RoleBinding) => [
             binding.getName(),
             <KubeObjectStatusIcon key="icon" object={binding} />,
-            binding.getNs(),
+            binding.getNs() || "-",
             binding.getSubjectNames(),
             binding.getAge(),
           ]}