Fix indenting typo in TestSTL.py



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@173470 91177308-0d34-0410-b5e6-96231b3b80d8
Fix buildbot building errors.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@173473 91177308-0d34-0410-b5e6-96231b3b80d8