Fix kpis not loading data
Fix kpis not loading data

On change dashboard, the kpi.directive is not running for each of the new kpis.
Replacing `track by $index` with `track by kpi.id` fixes this. Not too sure why =/.

maestrano/impac-angular,xaun/impac-angular,cesar-tonnoir/impac-angular,cesar-tonnoir/impac-angular,maestrano/impac-angular,xaun/impac-angular