fix copy in regenerate-files script

[brianneville]

As in the original regenerate-files script from https://github.com/openconfig/gnsi/pull/37/files#diff-fc93ffaaee0a108cd0141877980a22c2c5f782b529e4561cd11243753b91eed8 the copy should be from "${BASE}"/"${pkg}"/"${proto}"_go_proto_/"${GNOI_NS}"/"${pkg}"/*.pb.go to the target package rather than the "${BASE}"/"${pkg}"/"${proto}"_go_proto_/"${GNOI_NS}"/"${proto}"/*.pb.go which was in the base patch e.g. the files for packet link qualification will be under linkqual_go_proto_/github.com/openconfig/gnoi/packet_link_qualification/packet_link_qualification.pb.go

[brianneville]

related issue thread: https://github.com/openconfig/gnoi/issues/173#issuecomment-2098982800

[coveralls]

Pull Request Test Coverage Report for Build 8990651044

Details

• 0 of 175 (0.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.001%) to 1.201%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
packet_capture/packet_capture_grpc.pb.go	0	38	0.0%
packet_link_qualification/packet_link_qualification_grpc.pb.go	0	137	0.0%
<!--	Total:	0	175	0.0%	-->

Totals
Change from base Build 8911885186:	-0.001%
Covered Lines:	166
Relevant Lines:	13817

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💛 - Coveralls