Fix authors with mail and homepage

[nickvergessen]

Steps

1. Add an author to an app <author mail="mail@provider.com" homepage="http://example.com">Bernhard Posselt</author>
2. Search for "Bern Pos"

Expected

The app should show up

Actually

Searching for "object" brings up the app

@MorrisJobke@BernhardPosselt@LukasReschke

Will add to the backports of #1586

[mention-bot]

@nickvergessen, thanks for your PR! By analyzing the history of the files in this pull request, we identified @icewind1991, @DeepDiver1975 and @PVince81 to be potential reviewers.

[MorrisJobke]

Tested and works 👍

[nickvergessen]

@rullzer you already reviewed the backport

[rullzer]

Ah mm mtought I commented here as well.

LGTM!