Revert "Fixing that the validate-pull-request workflow should look for a parent PR in Lombiq/DotNest-Core-Sites-SDK"

This reverts commit 4f78b42.

Author: BenedekFarkas

.github/workflows/validate-pull-request.yml

@@ -7,5 +7,3 @@ jobs:
   validate-pull-request:
     name: Validate Pull Request
     uses: Lombiq/GitHub-Actions/.github/workflows/validate-submodule-pull-request.yml@dev
-    with:
-      repository: Lombiq/DotNest-Core-Sites-SDK