ipn/ipnlocal: preserve b.loginFlags in auto-login cc.Login calls

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LocalBackend stores loginFlags at construction so that per-instance
properties (e.g. LoginEphemeral set by tsnet.Server.Ephemeral) persist
for the session. StartLoginInteractiveAs already merges b.loginFlags
into its cc.Login call, but the two auto-login call sites pass bare
controlclient.LoginDefault, silently dropping any stored flags.

Merge b.loginFlags at both auto-login call sites to match the existing
StartLoginInteractiveAs pattern. LoginDefault is zero so this is a
no-op when loginFlags is empty, and restores the documented behavior
when it isn't.

Fixes #15852

Signed-off-by: Scott Graham <scott.github@h4ck3r.net>

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