Set public path to match the base config options for mini css loader

[agubler]

Type: bug

The following has been addressed in the PR:

• There is a related issue
• All code has been formatted with prettier
• Unit or Functional tests are included in the PR

Description:

Sets the publicPath of the mini CSS loader to the dojorc base option, defaulting to /. This ensure that assets can be loaded from code split CSS.

Resolves #315

[codecov]

Codecov Report

Merging #316 into master will decrease coverage by 0.13%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #316      +/-   ##
==========================================
- Coverage   47.97%   47.83%   -0.14%     
==========================================
  Files          10       10              
  Lines         690      692       +2     
  Branches      195      196       +1     
==========================================
  Hits          331      331              
- Misses        359      361       +2

Impacted Files	Coverage Δ
src/base.config.ts	18.64% <0%> (-0.16%)	⬇️

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[agubler]

This has caused issues when serving from a directory, investigating alternative fixes. Otherwise will possibly need to revert.