Fix lengthy URLs in tooltips

Summary: BUG: 389963

Test Plan:
To reproduce the issue (https://bugs.kde.org/show_bug.cgi?id=389963):

xattr -w user.xdg.origin.url "VeryLongUrlWithoutSpaces" file.name

Reviewers: Dolphin, ngraham

Reviewed By: Dolphin, ngraham

Subscribers: ngraham, elvisangelaccio, broulik, Baloo

Tags: Baloo

Differential Revision: https://phabricator.kde.org/D19988