Remove Polyfill leftovers (#32310)

Leftovers from #32057

build/build-plugins.js

@@ -59,7 +59,6 @@ const getConfigByPluginKey = pluginKey => {
     pluginKey === 'Data' ||
     pluginKey === 'Manipulator' ||
     pluginKey === 'EventHandler' ||
-    pluginKey === 'Polyfill' ||
     pluginKey === 'SelectorEngine' ||
     pluginKey === 'Util' ||
     pluginKey === 'Sanitizer'

build/rollup.config.js

@@ -12,7 +12,7 @@ let fileDest = `bootstrap${ESM ? '.esm' : ''}`
 const external = ['popper.js']
 const plugins = [
   babel({
-  // Only transpile our source code
+    // Only transpile our source code
     exclude: 'node_modules/**',
     // Include the helpers in the bundle, at most one copy of each
     babelHelpers: 'bundled'