chore: push the symbol zip not a folder

appveyor.yml

@@ -43,7 +43,7 @@ build_script:
   - ps: >-
       if ($env:GN_CONFIG -eq 'release') {
         python electron\script\zip-symbols.py
-        appveyor PushArtifact out/Default/electron.breakpad.syms
+        appveyor PushArtifact out/Default/symbols.zip
       }
 test_script:
   - if "%GN_CONFIG%"=="testing" ( echo Verifying non proprietary ffmpeg & python electron\script\verify-ffmpeg.py --build-dir out\Default --source-root %cd% --ffmpeg-path out\ffmpeg )