Some status were shown in the statusbar even though they were not specified in
the `statusbar_visible` attribute. This happened when the value was a substring
of one specified value.
Example:
```
hello = fields.Selection([('hello', 'Hello'), ('hello_world', 'Hello World')])
<field name='hello' widget='statusbar' statusbar_visible='hello_world'/>
```
In this case, both status were shown ('hello' is a substring of 'hello_world').
Fixes#20034
Martin Geubelle
75d9a2b4db