Don't throw when user cancels UAC prompt during registry update

[Tyrrrz]

Closes #335

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.35%. Comparing base (ece0250) to head (f02f53f).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #338   +/-   ##
=======================================
  Coverage   96.35%   96.35%           
=======================================
  Files           7        7           
  Lines         192      192           
  Branches       15       15           
=======================================
  Hits          185      185           
  Misses          6        6           
  Partials        1        1           

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