mimeset: Use TextSnifferAddon when using a custom MIME DB

That addresses the problem that packaged text files aren't correctly
identified (ticket #9972). All concerned packages have to be rebuilt,
o

mimeset: Use TextSnifferAddon when using a custom MIME DB

That addresses the problem that packaged text files aren't correctly
identified (ticket #9972). All concerned packages have to be rebuilt,
of course.

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