[nironics]

Two bugs meant ADMIN_API_KEY never worked for Plex, so multi-user setups failed with a 401 on /library/sections/all:

• The setup wizard saved the key as ADMIN_SYSTEM_APIKEY, but the config reads ADMIN_API_KEY
• AddHeader returned before attaching X-Plex-Token on its first call, and the admin client only calls it once, so the admin request went out with no token

Existing .env files written by the wizard need ADMIN_SYSTEM_APIKEY renamed to ADMIN_API_KEY. (This only applies to people who have .env files written by the wizard and not a working system setup due to the mismatch, so I imagine practically no one)

Tested to work personally as it unblocked me