Only check isType3Font the first time that TranslatedFont.loadType3Data is called

If the `TranslatedFont.type3Loaded` property exists, then you already know that the font must be a Type3 one.

Author: Snuffleupagus

src/core/evaluator.js

@@ -3378,13 +3378,12 @@ class TranslatedFont {
   }
 
   loadType3Data(evaluator, resources, task) {
-    if (!this.font.isType3Font) {
-      throw new Error("Must be a Type3 font.");
-    }
-
     if (this.type3Loaded) {
       return this.type3Loaded;
     }
+    if (!this.font.isType3Font) {
+      throw new Error("Must be a Type3 font.");
+    }
     // When parsing Type3 glyphs, always ignore them if there are errors.
     // Compared to the parsing of e.g. an entire page, it doesn't really
     // make sense to only be able to render a Type3 glyph partially.