Fix request #7375: Display color of trackers in the agiledashboard

When I choose a color for a tracker, I expect that the color is also
used in the agiledashboard. This helps to better understand what is
what in the content or planning view under the "type" column.

Change-Id: Ib17efd1b069c24413db82b891d9d6650bc89e054
Merge commit 'refs/changes/26/2926/1' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  Fix request #7375: Display color of trackers in the agiledashboard

Change-Id: I10ba9469422097a78f825e47fdbd323965e45a00
This is Tuleap 7.4.99.1

Change-Id: I683586ea19569ad65b53507fd9145f0027b5835f