wheezy: fix persistence-setup which crashes while creating new persistence after creating
Originally created by Tails on #5420 (Redmine)
Fix Persistence-setup which crashes while creating new persistence after creating persistent container but before configuring it (Icon ‘seahorse-key’ not present in theme at /usr/share/perl5/Tails/Persistence/Configuration/Button.pm line 45.)
Parent Task: #6015 (closed)