[clang-tidy] [modernize-use-auto] Fix test...

[clang-tidy] [modernize-use-auto] Fix test modernize-use-auto-new-remove-stars.cpp  after improvement

'tooling::fixit::getText' considers a length of "int *" to be 5 instead of 3 
in a new algorithm in https://reviews.llvm.org/rCTE329873. It was the root of 
the test failure.

llvm-svn: 329881