[Glitch] Remove Array.prototype.includes polyfill

Port c0886dee14 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/base_polyfills.js

@@ -1,16 +1,11 @@
 import 'intl';
 import 'intl/locale-data/jsonp/en';
 import 'es6-symbol/implement';
-import includes from 'array-includes';
 import assign from 'object-assign';
 import values from 'object.values';
 import { decode as decodeBase64 } from './utils/base64';
 import promiseFinally from 'promise.prototype.finally';
 
-if (!Array.prototype.includes) {
-  includes.shim();
-}
-
 if (!Object.assign) {
   Object.assign = assign;
 }

app/javascript/flavours/glitch/load_polyfills.js

@@ -12,7 +12,6 @@ function importExtraPolyfills() {
 
 function loadPolyfills() {
   const needsBasePolyfills = !(
-    Array.prototype.includes &&
     HTMLCanvasElement.prototype.toBlob &&
     window.Intl &&
     Object.assign &&