[JIRAALIGN-1686] Work Tree (Strategy View): No label on snapshot dropdown list

Issue Summary

There is no label on the Work Tree Strategy view for the snapshot field.

Steps to Reproduce

1. Set you T1 filter to Programs only
2. Navigate to Work Tree
3. Set your view to Strategy View (extra config)
4. Select a Program Increment
5. Notice the dropdown list with no lable.
   

Expected Results

This should be labelled as Snapshots.

Actual Results

No label on the Snapshot dropdown list.

Workaround

None.