Adapt autocomplete item to system font size

[joshliebe]

Task/Issue URL: https://app.asana.com/0/488551667048375/1207407556106269/f

Description

Fixes the issue reported in https://github.com/duckduckgo/Android/issues/4564

Steps to test this PR

• [x] Change the system font size to the largest option.
• [x] Type a word in the search bar.
• [x] Verify that the autocomplete item text is not clipped off.

(Tested on a Pixel 2, Android 11)

UI changes

[joshliebe]

• #4588 👈
• develop

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