fix: fixed placement of referenced workflow-file (#1365)

<!--- Provide a general summary of your changes in the Title above -->

## Description

Placed a referenced workflow-file in .github/workflows/<sub-directory>.
Not allowed according to github.
Fixed

## Related Issue(s)

- #1326 

## Verification

- [ ] **Your** code builds clean without any errors or warnings
- [ ] Manual testing done (required)
- [ ] Relevant automated test added (if you find this hard, leave it and
we'll help out)

## Documentation

- [ ] Documentation is updated (either in `docs`-directory, Altinnpedia
or a separate linked PR in
[altinn-studio-docs.](https://github.com/Altinn/altinn-studio-docs), if
applicable)

.github/workflows/dispatch-k6-performance.yml

@@ -44,7 +44,7 @@ on:
 jobs:
   k6-performance:
     name: "Run K6 performance test"
-    uses: ./.github/workflows/performance-workflows/workflow-run-k6-performance.yml
+    uses: ./.github/workflows/workflow-run-k6-performance.yml
     secrets:
       TOKEN_GENERATOR_USERNAME: ${{ secrets.TOKEN_GENERATOR_USERNAME }}
       TOKEN_GENERATOR_PASSWORD: ${{ secrets.TOKEN_GENERATOR_PASSWORD }}