Fix ext_is_admin option on google-apps conn type

[sergiught]

Proposed Changes

It seems the option is actually ext_is_admin instead of ext_admin for at least google-apps conn types.

Acceptance Test Output

$ go test ./... -v -run TestUser
=== RUN   TestConnectionOptions
--- PASS: TestConnectionOptions (2.67s)
=== RUN   TestConnectionOptions/GoogleApps
    --- PASS: TestConnectionOptions/GoogleApps (2.67s)
PASS
...

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