WPT: Fix malfunctioning excludes (#7)

@fhanau observed that the exclude list in #5 wasn't working properly. I've tried it out on a Linux machine, and am pretty sure this version should work

Author: npaun

.github/workflows/wpt.yml

@@ -22,12 +22,12 @@ jobs:
       - name: Create Github Release
         shell: bash
         run: |
-          # Excludes ~70% of files, making this archive faster to process
-          FILE_FILTER=(':(exclude)css' ':(exclude)html' ':(exclude)conformance-checkers' ':(exclude)svg')
-
           RELEASE_NAME=wpt-$(git rev-parse --short HEAD)
           gh release create -R ${{ github.repository }} $RELEASE_NAME || true
-          git archive --prefix=$RELEASE_NAME/ -o $RELEASE_NAME.tar.gz HEAD $FILE_FILTER
+          
+          # Excludes ~70% of files, making this archive faster to process
+          git archive --prefix=$RELEASE_NAME/ -o $RELEASE_NAME.tar.gz HEAD ':(exclude)css' ':(exclude)html' ':(exclude)conformance-checkers' ':(exclude)svg'
+          
           gh release upload -R ${{ github.repository }} $RELEASE_NAME $RELEASE_NAME.tar.gz
         env:
           GITHUB_TOKEN: ${{ github.TOKEN }}