Revert [23307] so new users in multisite are not automatically subscribers on the main site.

Merges [25183] to the 3.6 branch.

props duck_.
fixes #25166.
see #15627.


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Fix menu folding on new installs. fixes #24921 for 3.6.
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TinyMCE: fix editor focus issues after ontouchstart event on the parent document in iOS Safari. Fixes #25131 for 3.6.
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