fix: info will break if e.g. Roo::CSV is initialized by stream object

[TomFreudenberg]

Summary

This is a bug fix for method Base::info when object is initialized by stream and not filename

require 'roo'

content = "Id;Name;Surname;Title\n"
(1..1000).each { |i| content << "#{i};John;Wick;Actor\n" }
content_io = StringIO.new(content)
spreadsheet = Roo::CSV.new(content_io, csv_options: { col_sep: ';' })
puts spreadsheet.info
spreadsheet.reload
puts spreadsheet.info

What happens without this fix:

• info break to show filename
• second output of info will show wrong information cause not rewinded