fix(ibuffer): exclude ibuffer from global font-lock so its faces stand

ibuffer paints its rows with manual nerd-icons and ibuffer faces, and global font-lock was leaking font-lock-keyword-face onto the buffer and mode names. Exclude ibuffer-mode, the same fix as the shr-rendered reader modes. An empirical scan confirmed plain tabulated-list listings like package-menu and Buffer-menu survive font-lock untouched, so this is scoped to ibuffer, whose content trips keyword fontification.

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