Use global window hook for erc-keep-place-indicator

Use global window hook for erc-keep-place-indicator

* lisp/erc/erc-goodies.el
(erc--keep-place-indicator-on-window-buffer-change): Expect a frame
instead of a window argument for the only parameter, which is now
ignored, and exit early when entering a minibuffer.
(erc--keep-place-indicator-setup): Remove function because local
modules don't need a separate setup function.
(erc-keep-place-indicator-mode): Add autoload cookie even though this
is a local module, since this particular one is intended for more
granular, interactive activation.  This is mostly a formality because
it only matters in the unlikely event `erc-modules' is missing all
other modules defined in `erc-goodies'.
(erc-keep-place-indicator-mode, erc-keep-place-indicator-enable,
erc-keep-place-indicator-disable): Move functionality from
`erc--keep-place-indicator-setup' into enable body.  Use global
instead of local members for `erc-keep-place-mode-hook' and
`window-buffer-change-functions'.
(erc--keep-place-indicator-on-global-module): Perform necessary action
in all ERC buffers, not just the current one, where the user has
ostensibly disabled `erc-keep-place-mode'.
* test/lisp/erc/erc-goodies-tests.el
(erc-goodies-tests--assert-kp-indicator-on,
erc-goodies-tests--assert-kp-indicator-off): Change expected hook
membership for dependencies from global to local.
(erc-goodies-tests--keep-place-indicator): Use new helpers from
the `erc-tests-common' library.  (Bug#59943)