nats context ls not unicode-aware for string lengths

[philpennock]

The context ls command, at least, appears to be using something other than unicode display width for columnar alignment.

$ nats context ls
Known contexts:

   ngs-pdp-applewood   homesvr creds for synadia pdp-prod-applewood [our-js]
   ngs-pdp-applewood-anyhomesvr creds for synadia pdp-prod-applewood [any js]
   ngs-pdp-に           homesvr creds for synadia pdp-prod-に [our-js]
   ngs-pdp-に-any       homesvr creds for synadia pdp-prod-に [any js]
   tngs-pdp-a          homesvr creds for test-syn pdp-test-a [our-js]
[...]