Update Grain for Ash_Role

[KevinPlus3]

Updates the setting of the grain for ash_role so it will be picked up by ash-windows-formula's map.jinja.

Addresses issue #331.

[codecov]

Codecov Report

Merging #332 into develop will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff            @@
##           develop     #332   +/-   ##
========================================
  Coverage    18.33%   18.33%           
========================================
  Files           13       13           
  Lines          829      829           
  Branches        94       94           
========================================
  Hits           152      152           
  Misses         677      677

Impacted Files	Coverage Δ
src/watchmaker/workers/salt.py	14.08% <0%> (ø)	⬆️

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