prevent UI test failure randomly

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11971 e93f8b46-1217-0410-a6f0-8f06a7374b81
increase Capybara.default_wait_time from 6 to 7 (#12822)

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11972 e93f8b46-1217-0410-a6f0-8f06a7374b81