Fix naming for geojson

[hughhhh]

Fixed the naming for deckgl geojson in the vis type menu

[codecov-io]

Codecov Report

Merging #4946 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4946      +/-   ##
==========================================
+ Coverage   77.07%   77.07%   +<.01%     
==========================================
  Files          44       44              
  Lines        8558     8913     +355     
==========================================
+ Hits         6596     6870     +274     
- Misses       1962     2043      +81

Impacted Files	Coverage Δ
superset/connectors/sqla/models.py	76.37% <0%> (+0.04%)	⬆️
superset/utils.py	88.06% <0%> (+0.21%)	⬆️
superset/sql_lab.py	76.8% <0%> (+1.24%)	⬆️
superset/db_engine_specs.py	54.15% <0%> (+1.68%)	⬆️
superset/views/core.py	76.79% <0%> (+2.16%)	⬆️

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