cmd/tailscale/cli: set localClient.UseSocketOnly during flag parsing

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This configures localClient correctly during flag parsing, so that the --socket
option is effective when generating tab-completion results. For example, the
following would not connect to the system Tailscale for tab-completion results:

    tailscale --socket=/tmp/tailscaled.socket switch <TAB>

Updates #3793

Signed-off-by: Paul Scott <paul@tailscale.com>

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