fix navigation back service initialization

[antonborisoff]

Issue found by e2e tests

[github-actions]

Package	Line Rate	Branch Rate
app	100%	67%
app.components.contract	100%	100%
app.components.contracts	100%	75%
app.components.home	100%	100%
app.components.login	100%	100%
app.components.not-found	100%	100%
app.guards	100%	94%
app.services.auth	100%	100%
app.services.backend-error-handler	100%	100%
app.services.busy	98%	83%
app.services.busy.tests	100%	100%
app.services.contracts	100%	100%
app.services.features	100%	100%
app.services.message-box	100%	100%
app.services.message-box.component.message	89%	100%
app.services.navigation-back	100%	100%
app.tests	97%	91%
app.tests.foundation	100%	100%
app.tests.foundation.tests	100%	100%
transloco	89%	0%
Summary	99% (398 / 403)	90% (72 / 80)