appliance/postgresql: Use FLYNN_POSTGRES to match go-flynn/postgres.
appliance/postgresql: Use FLYNN_POSTGRES to match go-flynn/postgres.

See also 67677a867ef633e3a46ccdde06632d3396e4ac9f.

Signed-off-by: Michael Elsdörfer <17b9e1c64588c7fa6419b4d29dc1f4426279ba01@elsdoerfer.com>

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