CI: Remove validateToPublish input

It's not used anymore.

.github/actions/flatpak-builder-lint/action.yaml

@@ -7,10 +7,6 @@ inputs:
   path:
     description: Path to flatpak-builder manifest or Flatpak build directory
     required: true
-  validateToPublish:
-    description: If false, turns some errors to non-errors for non-publish workflow
-    required: false
-    default: true
   workingDirectory:
     description: Working directory to clone flatpak-builder-lint
     required: false

.github/workflows/build-project.yaml

@@ -286,7 +286,6 @@ jobs:
         with:
           artifact: manifest
           path: build-aux/com.obsproject.Studio.json
-          validateToPublish: false
 
       - name: Build Flatpak Manifest 🧾
         uses: flatpak/flatpak-github-actions/flatpak-builder@0ab9dd6a6afa6fe7e292db0325171660bf5b6fdf
@@ -304,14 +303,12 @@ jobs:
         with:
           artifact: builddir
           path: flatpak_app
-          validateToPublish: false
 
       - name: Validate repository
         uses: ./.github/actions/flatpak-builder-lint
         with:
           artifact: repo
           path: repo
-          validateToPublish: false
 
   windows-build:
     name: Windows 🪟