permissions bug fixes

[timifasubaa]

This PR fixes a few bugs with the permissions flow.

1. A typo
2. Making the name of the methods consistent with the names in the security manager

@michellethomas @graceguo-supercat

[codecov-io]

Codecov Report

Merging #5559 into master will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5559      +/-   ##
==========================================
+ Coverage   63.18%   63.24%   +0.05%     
==========================================
  Files         351      351              
  Lines       22252    22252              
  Branches     2470     2470              
==========================================
+ Hits        14060    14073      +13     
+ Misses       8177     8164      -13     
  Partials       15       15

Impacted Files	Coverage Δ
superset/views/core.py	73.86% <ø> (+0.22%)	⬆️
superset/models/core.py	87.09% <0%> (+0.34%)	⬆️
superset/db_engine_specs.py	54.19% <0%> (+1.17%)	⬆️

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