fix test failure (#22126)

<pre>
  1) Failure:
Redmine::I18nTest#test_number_to_human_size_for_each_language [.../test/unit/lib/redmine/i18n_test.rb:129]:
Expected /251/ to match "250 KB".
</pre>

git-svn-id: http://svn.redmine.org/redmine/trunk@15188 e93f8b46-1217-0410-a6f0-8f06a7374b81

config/locales/lt.yml

@@ -87,7 +87,7 @@ lt:
     human:
       format:
         delimiter: " "
-        precision: 2
+        precision: 3
       storage_units:
         format: "%n %u"
         units: