Make PlainTextExtractor match "text/plain" mimetype

Review Request #130013 - Created March 14, 2017 and submitted - Latest diff uploaded

Information
Igor Poboiko
kfilemetadata
Reviewers
kdeframeworks
anthonyfieroni

After commit 7c7e985a4678fef5f5d0dd8faa9b9cb42e3844b4 (see https://git.reviewboard.kde.org/r/129720/), PlainTextExtractor no longer matches ANY of the text/ mimetypes.
This broke completely Baloo indexing e.g. simple plain text files.
Introduced check however allows to provide "text/plain" as supported mimetype for the extractor and hope that everything containing plain text will be inherited from it.

KFileMetaData compiles.
Baloo indexes plain text files.
Everybody is happy.

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