fix: remove reference to deleted inputs.build_windows

Author: profvjreddi

.github/workflows/book-build-container.yml

@@ -341,7 +341,6 @@ jobs:
         run: |
           echo "🎯 Target branch: ${{ inputs.target }}"
           echo "🐧 Build Linux: ${{ inputs.build_linux }}"
-          echo "🪟 Build Windows: ${{ inputs.build_windows }}"
           echo "📄 Build HTML: ${{ inputs.build_html }}"
           echo "📑 Build PDF: ${{ inputs.build_pdf }}"
           echo "📚 Build EPUB: ${{ inputs.build_epub }}"