fix(testWithSpectron): point execa at vue cli service bin

Author: nklayman

lib/testWithSpectron.js

@@ -11,9 +11,8 @@ module.exports = (spectron, options = {}) =>
     let outputDir = ''
     // Launch electron:serve in headless mode
     const child = execa(
-      'node',
+      require.resolve('@vue/cli-service/bin/vue-cli-service'),
       [
-        require.resolve('@vue/cli-service/bin/vue-cli-service'),
         'electron:serve',
         '--headless',
         '--mode',