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Dstm config override has old syntax, please edit wallet warning after upgrade to 0.5-31

I upgraded all my rigs to Hive OS version 0.5-31 last night. All went well and all the dstm miner on all my rigs properly reconnected to the pool afterwards. However, I have the following warning on all my rigs:

My wallet config is very simple for dstm and looks as follows:

So what exactly do I need to change to make that warning message go away?