_otter_env_core.sh: remove proxy autoconfiguration

Marek Szubarequested to merge
env_no_proxy_setup into master

Created by: mkszuba

This particular bit of code only does something when on the Sanger network, probably doesn't do anything useful even when on the Sanger network now that Otter servers are on Embassy, and on some machines attempting to retrieve the local FQDN while on the EBI network visibly delays start-up of the Otter client.

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