fix(postcss-reduce-initial): ensure options are always read

[ludofischer]

Fix #1436

Ensure options are read also when the plugin is configured in cssnano instead as a standalone PostCSS plugin.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (99d1e6a) 96.97% compared to head (b3c59f7) 96.97%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1482   +/-   ##
=======================================
  Coverage   96.97%   96.97%           
=======================================
  Files         123      123           
  Lines       10136    10138    +2     
=======================================
+ Hits         9829     9831    +2     
  Misses        307      307           

Impacted Files	Coverage Δ
packages/postcss-reduce-initial/src/index.js	100.00% <100.00%> (ø)

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