`SearchResultsModel` performs queries without text

[qstokkink]

[This issue is reposted from the Tribler Experimental fork and seems to be applicable to the main branch. It is worth investigating if this can be reproduced on main.]

The SearchResultsModel does not call its super with a text_filter. This caused local searches to essentially return 200 random torrents.

The fix that worked on the experimental fork was the following: