chore(.clang-tidy): fix settings of readability-identifier-naming #2823
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Description
The settings that I added in #2763 was a bit wrong.
_
for PrivateMemberSuffix.Google C++ Style Guide says
Data members of classes, both static and non-static, are named like ordinary nonmember variables, but with a trailing underscore
.g_
for GlobalConstantCase.ROS 2 Docs says
For global variables use lowercase with underscores prefixed with g_
.For these lines.
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