ticket:9721: Fix some uconfig test failures

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@33311 251d0590-4201-4cf1-90de-194747b24ca1
ticket:9801: Fix some incorrect usage of UnicodeString constructor

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@33312 251d0590-4201-4cf1-90de-194747b24ca1