Fix Variablehandling in dashboard

<!-- Please only use this template for submitting feature requests --> **Why is this needed**: Depending Variables should depend on rows too **What would you like to be added**: When i use varibles wich are on top of another variables, the repeat option should recognize the skope of the first variable Example: - Systems = {"find":"terms","field":"system.keyword"} - Items = {"find":"terms", "field":"check_item.keyword","query":"system:$Systems"} - Set up row, repeat for Systems - Set up visualisation, repeat for Items - Every Row show all Items of All Systems Expected is - Every repeated row should only deliver "Items" for the "System" he shows, to prevent having useless spacewasting fields.  This example shows, the dev entry has an 1 for available, the qa 0 for not. i want only see things wich are available **Who is this feature for?** All of us