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Fix confidential self transfer with fees #3193
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Currently, a self-transfer with fees using the confidential extension incurs a fee. This PR modifies the confidential transfer processor logic so that fee amount is not deducted for self-transfers.
I initially thought that this would require an involved update to the zk-token-sdk due to the way fee amount is encrypted in the transfer amount. It turned out that this could be fixed rather simply without any updates to the sdk.