Sort quick select entries in grepdialog

Summary: In bug 380449 a proposal for sorting the entries in the quick select button suggests an alphabetical ordering of the project URLs.

BUG: 380449
FIXED-IN: 5.1.2

Test Plan:

1. open several projects with KDevelop
2. select Find/Replace for a Project
3. find all other projects ordered alphabetically

Reviewers: KDevelop, apol

Reviewed By: KDevelop, apol

Subscribers: kdevelop-devel

Tags: KDevelop

Differential Revision: https://phabricator.kde.org/D6085