Update go:generate instructions for mockery

[Lagovas]

Found that go generate generates new files that not under git control. This instructions generate files in acra/keystore/kms/base/mocks folder. But we use mocks from acra/keystore/mocks. I think it was tested locally from keystore/kms folder and left as is. But we run and stay with approach of running from root of repo, so I updated paths to generate them where they are expected.

Also, found that my local mocker version v2.12.3 cannot re-generate mocks (when I tried to test with new paths) fails due to variables' name similar to package (context name used and similar to context package), and produced extra warnings. So, tested and re-generated with fresh v2.14.0 version to be sure that tests pass with new paths.

Checklist

• [ ] Change is covered by automated tests
• [ ] The coding guidelines are followed
• [ ] Public API has proper documentation in the Acra documentation site or has PR on documentation repository with new changes
• [ ] CHANGELOG.md is updated (in case of notable or breaking changes)
• [ ] CHANGELOG_DEV.md is updated
• [ ] Benchmark results are attached (if applicable)
• are up-to-date (in case of API changes)