repair ad samples format

src/main/java/examples/dataloader/AdSampleConstructor.java

@@ -33,7 +33,7 @@ public class AdSampleConstructor {
         requestContext.setMachineinfoBrand(record.getString("machineinfo_brand"));
         requestContext.setMachineinfoModel(record.getString("machineinfo_model"));
         requestContext.setMachineinfoSdkversion(record.getString("machineinfo_sdkversion"));
-        requestContext.setMachineinfoSdkversion(record.getString("machineinfo_wechatversion"));
+        requestContext.setMachineinfoWchatversion(record.getString("machineinfo_wechatversion"));
         requestContext.setDay(record.getString("ctx_day"));
         requestContext.setWeek(record.getString("ctx_week"));
         requestContext.setHour(record.getString("ctx_hour"));