modules/auxiliary/crawler: Resolve RuboCop violations

[bcoles]

Most violations resolved with rubocop -A, except notes.

• Fixes a bug due to a typo where @curent_site was used instead of @current_site.
• Replaces multiple tabs with spaces

There are likely many bugs still present. I'm not interested in fixing them. I'm especially not interested in fixing the canonicalize method.

[jheysel-r7]

I think this might be less of an abomination:

  def canonicalize(uri)
    uri = URI(uri) unless uri.is_a?(URI)
    uri.normalize!

    path = uri.path.dup
    segments = path.split('/')
    resolved = []

    segments.each do |segment|
      next if segment == '.' || segment.empty?

      if segment == '..'
        resolved.pop unless resolved.empty?
      else
        resolved << segment
      end
    end

    uri.path = '/' + resolved.join('/')
    uri.to_s
  end

[bcoles]

You're welcome to implement this change.