Add `.fastlane` to fastlane folder icons

[naoigcat]

Add the .fastlane folder because it is referenced the same way as the fastlane folder.

https://github.com/fastlane/fastlane/blob/9ae433c617a13c0801a9b45f2cf7f8139fbdb427/credentials_manager/lib/credentials_manager/appfile_config.rb#L19

    def self.default_path
      ["./fastlane/Appfile", "./.fastlane/Appfile", "./Appfile"].each do |current|
        return current if File.exist?(current)
      end
      nil
    end

https://github.com/fastlane/fastlane/blob/9ae433c617a13c0801a9b45f2cf7f8139fbdb427/fastlane/lib/assets/completions/completion.bash#L14

  # look for Fastfile either in this directory or fastlane/ then grab the lane names
  if [[ -e "Fastfile" ]]; then
    file="Fastfile"
  elif [[ -e "fastlane/Fastfile" ]]; then
    file="fastlane/Fastfile"
  elif [[ -e ".fastlane/Fastfile" ]]; then
    file=".fastlane/Fastfile"
  else
    return 1
  fi