Renames variables to match columns for label settings

[Godmartinz]

This just changes barcode_type and alt_barcode to label2_2d_type and label2_1d_type respectively in the settings seeder. as per the changes in #15446

[what-the-diff]

PR Summary

• Renamed barcode settings key
  The setting key previously known as barcode_type has been updated to be more specific and now called label2_2d_type to reflect that it represents 'QRCODE' value.

• Updated alternative barcode
  What was once alt_barcode has been transformed into label2_1d_type, which now holds the value 'C128'. This makes the setting more precisely descriptive.