Bugfix/AWS IAM policies

[x4v13r64]

Fix for #367 and for the AWS MFA JS helper function.

[codecov-io]

Codecov Report

Merging #370 into develop will increase coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop     #370      +/-   ##
===========================================
+ Coverage    34.52%   34.53%   +0.01%     
===========================================
  Files          188      188              
  Lines         6234     6229       -5     
===========================================
- Hits          2152     2151       -1     
+ Misses        4082     4078       -4

Impacted Files	Coverage Δ
ScoutSuite/providers/base/configs/browser.py	55% <100%> (+2.69%)	⬆️

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