Update DropdownMenu to set selected item as active one

[flacial]

Closes #2188
Related to #1975

Problem

When an item is selected, it doesn't get set as the active item.

Solution

Create a state and set the selected item as the active one.

Test

1. Click the dropdown menu
2. Select an item
3. Notice how it gets set as the dropdown menu text next to the arrow

---

Storybook

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Name	Status	Preview	Updated
c0d3-app	✅ Ready (Inspect)	Visit Preview	Sep 3, 2022 at 5:14AM (UTC)

[codecov]

Codecov Report

Merging #2189 (690f9e2) into master (7335130) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master     #2189   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          174       174           
  Lines         2958      2960    +2     
  Branches       797       795    -2     
=========================================
+ Hits          2958      2960    +2     

Impacted Files	Coverage Δ
components/DropdownMenu.tsx	100.00% <100.00%> (ø)