fix node tests - no need to require atob/btoa

Author: HackbrettXXX

test/deployment/node/loadGlobals.js

@@ -1,8 +1,6 @@
 /* eslint-disable no-unused-vars */
 
 global.loadGlobals = function() {
-  global.btoa = require("btoa"); // used in some specs
-
   global.Canvg = require("canvg").Canvg;
   const jsPDF = require("../../../dist/jspdf.node.js");
   global.jsPDF = jsPDF.jsPDF;

test/specs/Uint8Array.spec.js

@@ -5,9 +5,6 @@
 
 describe("Module: addimage Uint8Array", () => {
   beforeAll(loadGlobals);
-  if (typeof global !== "undefined" && global.isNode == true) {
-    eval("var atob = require('atob')");
-  }
   function convertDataURIToArrayBuffer(dataURI) {
     var BASE64_MARKER = ";base64,";
     var base64Index = dataURI.indexOf(BASE64_MARKER) + BASE64_MARKER.length;