refactor(mu4e-contacts): drop no-op completion hook surgeryHEADmain

mu4e 1.14 calls mu4e--compose-setup-completion directly during compose setup, never via mu4e-compose-mode-hook, so the activate path's remove-hook did nothing and the deactivate path's add-hook installed a function that was never hook-driven. The mu4e-compose-complete-addresses variable already gates the built-in completion on both paths. I also declared that variable for the compiler, which clears the module's two free-variable warnings.

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