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