searchable: flatten array before matching
searchable: flatten array before matching

Fix #13203 which occurs when searching cask descriptions.

MikeMcQuaid/brew,MikeMcQuaid/brew,Homebrew/brew,JCount/brew,nandub/brew,Homebrew/brew,Homebrew/brew,MikeMcQuaid/brew,nandub/brew,nandub/brew,MikeMcQuaid/brew,nandub/brew,Homebrew/brew,JCount/brew,JCount/brew,JCount/brew