ci: fixed line that was missing an echo

.github/workflows/ci.yml

@@ -36,7 +36,7 @@ jobs:
         FILENAME="ffmpeg-n4.4-latest-win32-gpl-shared-4.4"
         curl -fLOSs https://github.com/sudo-nautilus/FFmpeg-Builds-Win32/releases/download/latest/$FILENAME.zip
         7z x $FILENAME.zip
-        $FILENAME >> $GITHUB_PATH
+        echo "$FILENAME" >> $GITHUB_PATH
 
     - name: Build
       shell: bash