[iOS] default bundleType is Vue on eagle

Author: jianhan-he

weex_core/Source/core/network/ios/default_request_handler.mm

@@ -33,7 +33,8 @@
         NSURL* nsURL = [NSURL URLWithString:NSSTRING(url)];
         [[WXSDKManager bridgeMgr] DownloadJS:@(instance_id) url:nsURL completion:^(NSString *script) {
             WXPerformBlockOnBridgeThread(^{
-                callback([script UTF8String] ? : "", "");
+                NSString* bundleType = @"Vue";
+                callback([script UTF8String] ? : "", [bundleType UTF8String]);
             });
         }];
     }