Change ProjectPatch#copy

The RedmineDmsf::Patches::ProjectPatch#copy method override misses to
return a final false. This missing boolean of false cause a Redmine
core test to fail.

This little change fixes the failing core test:

ProjectCopyTest#test_copy_should_return_false_if_save_fails.

lib/redmine_dmsf/patches/project_patch.rb

@@ -39,6 +39,8 @@ module RedmineDmsf
             send "copy_#{name}", project
           end
           save
+        else   
+          false
         end
       end