[scripts] remove services from clang paths

Summary:
Discovered those logs:

find: ‘services/lib/src’: No such file or directory
find: ‘services/tunnelbroker/test’: No such file or directory
find: ‘services/backup/test’: No such file or directory
find: ‘services/blob/test’: No such file or directory

There is no C++ code in services anymore.

Test Plan: yarn clang-format-all.

Reviewers: bartek, michal

Reviewed By: bartek

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D9880