Unify default value for restricting user enumeration with settings #20139
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Follow up to #19569
If the value was never enabled or disabled, the settings show Restrict username enumeration to groups as disabled. However, in some components it was enabled by default, which caused an inconsistency in the behaviour with respect to the settings, for example in the contacts menu.
The acceptance tests for header were failing because of this. I have also added a new test to check the behaviour when username autocompletion is restricted to groups.