Sort quick select entries in grepdialog

Summary: In bug [[ https://bugs.kde.org/show_bug.cgi?id=380449 | 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:
  # open several projects with KDevelop
  # select Find/Replace for a Project
  # 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