[clang-tidy] Move misc-use-override and readability-shrink-to-fit to "modernize/"

These checks are focusing on migrating the code from C++98/03 to C++11, so they
belong to the modernize module.

llvm-svn: 246437
GitOrigin-RevId: 0ed6c478a4699854d68718eda35d14d900fb8199
20 files changed