fix(Dropdown, DropdownItem, ListItem): Updating theme files

[bcalvery]

Redline match for Dropdown and DropdownItem.

before:

after:

The redlines call for a "selected indictor" (checkmark) next to any item that is currently selected in the dropdown, and that is not implemented here because this is supposed to just be a style update.

[codecov]

Codecov Report

Merging #1523 into master will decrease coverage by 0.11%.
The diff coverage is 23.07%.

@@            Coverage Diff             @@
##           master    #1523      +/-   ##
==========================================
- Coverage   71.66%   71.55%   -0.12%     
==========================================
  Files         838      838              
  Lines        6850     6858       +8     
  Branches     1961     1947      -14     
==========================================
- Hits         4909     4907       -2     
- Misses       1935     1945      +10     
  Partials        6        6

Impacted Files	Coverage Δ
...ackages/react/src/components/Dropdown/Dropdown.tsx	88.52% <ø> (-0.03%)	⬇️
...-contrast/components/Dropdown/dropdownVariables.ts	0% <ø> (-50%)	⬇️
...themes/teams/components/Dropdown/dropdownStyles.ts	13.88% <ø> (ø)	⬆️
...eams-dark/components/Dropdown/dropdownVariables.ts	0% <ø> (ø)	⬆️
...src/themes/teams/components/List/listItemStyles.ts	20.83% <0%> (-2.98%)	⬇️
...es/teams/components/Dropdown/dropdownItemStyles.ts	8.33% <0%> (-11.67%)	⬇️
...mes/teams/components/Dropdown/dropdownVariables.ts	50% <100%> (ø)	⬆️
packages/react/src/components/List/ListItem.tsx	100% <100%> (ø)	⬆️

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[levithomason]

👍

[levithomason]

If the redline is correct here, let's merge 👍