fix(form-field-custom-control-example) _focused signal not firing stateChanges #29944
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Fixes that form-field-custom-control-example.ts wasn't correctly handling focused events.
This can easily be checked on the official docs page or the stackblitz, here's two sample screenshots:
In the above screenshot, the user has focused the input, but the form field outline is not becoming blue.
Another failure case is when you leave the input: in this case, it will stay forever outlined in blue: