Fix paths that were forgotten.

features/step_definitions/unsafe_browser.rb

@@ -166,14 +166,14 @@ Then /^the Unsafe Browser complains that no DNS server is configured$/ do
 end
 
 Then /^I configure the Unsafe Browser to check for updates more frequently$/ do
-  prefs = '/usr/share/tails/unsafe-browser/prefs.js'
+  prefs = '/usr/share/tails/chroot-browsers/unsafe-browser/prefs.js'
   $vm.file_append(prefs, 'pref("app.update.idletime", 1);')
   $vm.file_append(prefs, 'pref("app.update.promptWaitTime", 1);')
   $vm.file_append(prefs, 'pref("app.update.interval", 5);')
 end
 
 But /^checking for updates is disabled in the Unsafe Browser's configuration$/ do
-  prefs = '/usr/share/tails/unsafe-browser/prefs.js'
+  prefs = '/usr/share/tails/chroot-browsers/unsafe-browser/prefs.js'
   assert($vm.file_content(prefs).include?('pref("app.update.enabled", false)'))
 end