mu4e: add 'c' binding to mu4e-search-query and remove 'cc' binding

[RyanGibb]

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mu4e-search-query was introduced in mu4e v1.12.0:

• New command ~mu4e-search-query~ (bound to =c=) which lets you pick a query (from bookmark / maildir shortcuts) with completion in main / headers / view buffers.

Bindings are added for the main and headers view.

Upstream binds c to mu4e-search-query, and we follow every other binding on the main screen, so we drop the colliding cc binding

See https://github.com/emacs-evil/evil-collection/pull/844, and https://github.com/emacs-evil/evil-collection/pull/860.