Remove leftover `args[0].code` checks from the `OPS.paintXObject` cases in evaluator.js

From looking at blame, it seems that these checks became obsolete with PR 692 (which landed close to six years ago). Note how, after that PR, there's no longer anything being assigned to the `code` property of an Object.

src/core/evaluator.js

@@ -915,9 +915,6 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
 
           switch (fn | 0) {
             case OPS.paintXObject:
-              if (args[0].code) {
-                break;
-              }
               // eagerly compile XForm objects
               var name = args[0].name;
               if (!name) {
@@ -1631,10 +1628,6 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
               break;
             case OPS.paintXObject:
               flushTextContentItem();
-              if (args[0].code) {
-                break;
-              }
-
               if (!xobjs) {
                 xobjs = (resources.get('XObject') || Dict.empty);
               }