Stop overriding dit_adviser for new interactions

[reupen]

As discussed with @jim68000, this stops the overriding of the dit_adviser that the front end was sending when creating interactions.

The front end will be amended to default to the current user when creating an interaction.

This change will also alter the behaviour of the home-page endpoint an interaction will show up on the home page of the user entered as the adviser for that interaction, which was discussed as more desirable.

[codecov-io]

Codecov Report

Merging #253 into develop will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #253      +/-   ##
===========================================
- Coverage    92.76%   92.74%   -0.02%     
===========================================
  Files           56       56              
  Lines         1990     1985       -5     
  Branches       179      178       -1     
===========================================
- Hits          1846     1841       -5     
  Misses         122      122              
  Partials        22       22

Impacted Files	Coverage Δ
datahub/interaction/views.py	100% <ø> (ø)	⬆️

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