* lisp/erc/erc-goodies.el (erc-scrolltobottom-mode)
(erc-scrolltobottom-enable): Always remove hook functions whose
membership hinges on the value of `erc-scrolltobottom-all'. In ERC 5.6,
an init file's `setopt' form containing an `erc-modules' assignment
before an `erc-scrolltobottom-all' one would result in conflicting sets
of hook members come `erc-open'. Having such option-dependent branching
in module setup, while difficult to maintain, is a long held ERC
practice, as seen in functions like `erc-nickserv-identify-mode'.
Making all new modules "local" may be the most manageable solution
because existing global modules can't be made to require prior
deactivation.
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