bug#60935: 30.0.50; ERC >5.5: Improve ERC's treatment of customization groups

[J.P.]

Seems I was under the mistaken impression that all customizations with a
"CHANGED" state get saved when hitting C-x C-s (`Custom-save'), which is
obviously not the case. Thus, I think it's best not to mislead users by
spoofing the modification state because the only benefit of doing so now
is that carats aren't automatically thrown open on module-var widgets,
which is a comparatively minor annoyance. The attached patch reverts
this spoofing nonsense and also restores a working toggle button so
users again have the option of dismissing the warning.

0001-5.6-Restore-module-var-toggles-in-ERC-s-Custom-buffe.patch
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