fix: enable running rekey in a non-interactive shell #362
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This PR fixes an issue of rekeying in a non-interactive shell.
With the current code,
EDITORwill be set tocp -- /dev/stdinin a non-interactive shell and hence theCLEARTEXT_FILEwill be overwritten with an empty string - effectively erasing the secret value. This PR fixes that by only calling editor if we're not rekeying.