fix(useless-self-assignment): correct useless-self-assignment

[rasmi-ranjan-guavus]

#bug Remove or correct this useless self-assignment.

Superset version

0.29

[codecov-io]

Codecov Report

Merging #7090 into master will increase coverage by 0.13%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #7090      +/-   ##
==========================================
+ Coverage   64.46%   64.59%   +0.13%     
==========================================
  Files         422      422              
  Lines       20566    20586      +20     
  Branches     2250     2251       +1     
==========================================
+ Hits        13257    13297      +40     
+ Misses       7182     7167      -15     
+ Partials      127      122       -5

Impacted Files	Coverage Δ
superset/views/utils.py	92.85% <100%> (-0.25%)	⬇️
...et/assets/src/dashboard/reducers/dashboardState.js	91.66% <0%> (-2.62%)	⬇️
...src/dashboard/components/HeaderActionsDropdown.jsx	67.44% <0%> (-2.56%)	⬇️
superset/models/core.py	83.56% <0%> (-0.06%)	⬇️
...t/assets/src/dashboard/reducers/getInitialState.js	0% <0%> (ø)	⬆️
...ssets/src/dashboard/containers/DashboardHeader.jsx	100% <0%> (ø)	⬆️
...rset/assets/src/dashboard/components/SaveModal.jsx	46.15% <0%> (ø)	⬆️
superset/common/query_object.py	26.31% <0%> (ø)	⬆️
superset/viz.py	71.53% <0%> (ø)	⬆️
superset/views/core.py	74.92% <0%> (+0.01%)	⬆️
... and 6 more

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