[Regression] hitting delete doesn't clear urlbar suggestions

[diracdeltas]

• Platform (Win7, 8, 10? macOS? Linux distro?):
  os x

• Brave Version:
  766722a

• Steps to reproduce:

  1. clear browsing history, go to https://fusion.net/series/trump-vs-bernie/
  2. open new tab, type in fusion.net and watch it autocomplete to https://fusion.net/series/trump-vs-bernie/
  3. delete the autocomplete suffix and hit enter. it goes to https://fusion.net/series/trump-vs-bernie/ instead of https://fusion.net/ because the first autocomplete result is still selected

• Screenshot if needed:

• Any related issues: