Only include Persona JS when Persona is enabled

Dependencies

• [2] PFB5ZUQW Fix legacy login
• [3] 36ZTCZ4F Add basic Persona support
• [4] D44B24QC Store the account type ("hydra" or "persona") explicitly in the database
• [*] J5UVLXOK * Start of a basic Catalyst web interface.

Change contents

• replacement in src/root/layout.tt at line 120
  [2.603]→[2.603:618](∅→∅)
  − [% ELSE %]
  [2.603]

  [2.618]
  + [% ELSIF personaEnabled %]