request #6779: No more able to drag and drop columns in report table

Change-Id: I2eddf4527679842ff3a88d7d0daa2c0752b3d94e
Merge commit 'refs/changes/59/2359/1' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  request #6779: No more able to drag and drop columns in report table
This is Tuleap 6.12.99.88

Change-Id: I96ddc4b32bd5579601c94a1a33e54c3aff22658b