Default to primary group on loading.

[jkmarx]

• Defaults to primary group when dashboard loads, if a primary group has been selected.

[jkmarx]

the child component is responsible for loading the initial dashboard's data sets

[codecov]

Codecov Report

Merging #2939 into develop will decrease coverage by 0.32%.
The diff coverage is 66.66%.

@@             Coverage Diff             @@
##           develop    #2939      +/-   ##
===========================================
- Coverage    59.73%   59.41%   -0.33%     
===========================================
  Files          434      435       +1     
  Lines        27767    27320     -447     
  Branches      1280     1274       -6     
===========================================
- Hits         16587    16231     -356     
+ Misses       11180    11089      -91

Impacted Files	Coverage Δ
...ce/js/dashboard/controllers/data-sets-card-ctrl.js	69.02% <ø> (+0.27%)	⬆️
...dashboard/controllers/primary-group-button-ctrl.js	91.66% <66.66%> (-2.46%)	⬇️
refinery/core/views.py	42.49% <0%> (-3.84%)	⬇️
refinery/core/forms.py	78.04% <0%> (-1.37%)	⬇️
refinery/core/serializers.py	84.93% <0%> (-1.35%)	⬇️
...ry/ui/source/js/dashboard/controllers/dashboard.js	9.25% <0%> (-0.02%)	⬇️
refinery/core/urls.py	100% <0%> (ø)	⬆️
refinery/core/test_views.py	100% <0%> (ø)	⬆️
refinery/ui/source/js/commons/services/projects.js	25% <0%> (ø)
... and 2 more

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