[PR] [fix](Backup) use correct variable name to check the conf correctness when doing backup job [doris]

[via GitHub]

ByteYue opened a new pull request, #25434:
URL: https://github.com/apache/doris/pull/25434

   ## Proposed changes
   
   Issue Number: close #xxx
   When using backup on doris, user might encounter following error
   
![image](https://github.com/apache/doris/assets/43750022/9c12b53c-3d75-4b75-a2df-87bac6f5673f)
   
   We need to use the correct variable name passed from FE like what are 
defined;
   
![image](https://github.com/apache/doris/assets/43750022/45392738-d92d-4419-82ad-8f98d7af5964)
   
   
   <!--Describe your changes.-->
   
   ## Further comments
   
   If this is a relatively large or complex change, kick off the discussion at 
[d...@doris.apache.org](mailto:d...@doris.apache.org) by explaining why you 
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