Lint issues in internal/command/twofactor* Go packages

internal/command/twofactorrecover/twofactorrecover.go:37:15: Error return value of `fmt.Fprintln` is not checked (errcheck)
internal/command/twofactorrecover/twofactorrecover.go:47:14: Error return value of `fmt.Fprintln` is not checked (errcheck)
internal/command/twofactorrecover/twofactorrecover.go:70:13: Error return value of `fmt.Fprint` is not checked (errcheck)
internal/command/twofactorrecover/twofactorrecover.go:73:14: Error return value of `fmt.Fprintf` is not checked (errcheck)
internal/command/twofactorrecover/twofactorrecover_test.go:31:5: go-require: do not use require in http handlers (testifylint)
internal/command/twofactorverify/twofactorverify.go:40:12: Error return value of `fmt.Fprint` is not checked (errcheck)
internal/command/twofactorverify/twofactorverify.go:71:13: Error return value of `fmt.Fprintf` is not checked (errcheck)
internal/command/twofactorverify/twofactorverify_test.go:38:5: go-require: do not use require in http handlers (testifylint)
internal/command/twofactorverify/twofactorverify_test.go:41:5: go-require: do not use require in http handlers (testifylint)
internal/command/twofactorverify/twofactorverify_test.go:56:6: go-require: do not use require in http handlers (testifylint)
internal/command/twofactorverify/twofactorverify_test.go:68:5: go-require: do not use require in http handlers (testifylint)
internal/command/twofactorverify/twofactorverify_test.go:71:5: go-require: do not use require in http handlers (testifylint)

assigned to @idrozdov