Added loader to datagrid with setter method

Added loader to datagrid with setter method

Testing:
Check that datagrids still look as before, on IE aswell.
Loading not used yet.

issue https://github.com/A24Group/Triage/issues/6153
the layer that holds the datagrid is 30px from left, so to have loader in the center i have to put loader layer 30px left aswell