!80 fix:修复Map任务问题不能重试

* fix(sj_1.2.0-beta1):修复Map任务不能重试问题

snail-job-server/snail-job-server-job-task/src/main/java/com/aizuda/snailjob/server/job/task/support/callback/MapClientCallbackHandler.java

@@ -21,7 +21,7 @@ public class MapClientCallbackHandler extends MapReduceClientCallbackHandler {
     }
 
     @Override
-    public void callback(ClientCallbackContext context) {
+    protected void doCallback(ClientCallbackContext context) {
         super.doCallback(context);
     }
 }