Send/receive Type3 images the same way as other globally-cached images

There's quite frankly no particular reason to special-case Type3-fonts with image resources, which are very rare anyway, now that we have a general mechanism for sending/receiving images globally.

src/display/api.js

@@ -2265,7 +2265,6 @@ class WorkerTransport {
             });
           break;
         case "FontPath":
-        case "FontType3Res":
         case "Image":
           this.commonObjs.resolve(id, exportedData);
           break;