fix(list): Don't allow graphic to shrink when text overflows

[acdvorak]

Fixes #1941

[codecov-io]

Codecov Report

Merging #1943 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1943      +/-   ##
==========================================
+ Coverage   99.43%   99.43%   +<.01%     
==========================================
  Files          84       84              
  Lines        3717     3721       +4     
  Branches      485      484       -1     
==========================================
+ Hits         3696     3700       +4     
  Misses         21       21

Impacted Files	Coverage Δ
packages/mdc-textfield/helper-text/foundation.js	93.1% <0%> (-1.5%)	⬇️
packages/mdc-ripple/foundation.js	100% <0%> (ø)	⬆️
packages/mdc-menu/simple/constants.js	100% <0%> (ø)	⬆️
packages/mdc-select/foundation.js	100% <0%> (ø)	⬆️

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[moog16]

LGTM