fix(list): Lists have incorrect padding

[touficbatache]

Fixes and closes #1488

[codecov-io]

Codecov Report

Merging #1523 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1523   +/-   ##
=======================================
  Coverage   99.82%   99.82%           
=======================================
  Files          69       69           
  Lines        3392     3392           
  Branches      424      424           
=======================================
  Hits         3386     3386           
  Misses          6        6

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[lynnmercier]

LGTM, and I checked with our designers.

Both Drawer and Menu use mdc-list within their structure...but both of them override this padding style. So this change has no effect on Drawer or Menu