ble: simplify and substitute errors.Wrap()

[gen2thomas]

Solved issues and/or description of the change

Archived package ""github.com/pkg/errors" now removed from gobot, see #952 . Additionally:

• multiple wrapping of the same error was removed in "ble_client_adaptor.go".
• go.mod and go.sum cleaned

Manual test

no

Checklist

• The PR's target branch is 'hybridgroup:dev'
• New and existing unit tests pass locally with my changes (e.g. by run make test)
• No linter errors exist locally (e.g. by run make fmt_check)
• I have performed a self-review of my own code

[jney]

Can't it be just "errors"?

[gen2thomas]

yes, this would be also possible, but a good practice is to use one of "fmt.Errorf()" or "errors.New()" in one file (some say also in one project)