Fix edit group navigation bug

[bruno-atmire]

References

Fixes #1127

Description

When navigating away from an "edit group" page (Access Control), the group list would be shown, regardless of user intentions. This PR eliminates a call to router.navigate such that navigation works again as intended.

Instructions for Reviewers

• Log into DSpace
• Open the group list (sidebar > Access Control > Groups)
• Open the edit page of any group
• Navigate to any page and observe that the expected page is opened. (Without this PR, the group list would always open.)

Checklist

• My PR is small in size (e.g. less than 1,000 lines of code, not including comments & specs/tests), or I have provided reasons as to why that's not possible.
• My PR passes TSLint validation using yarn run lint
• My PR doesn't introduce circular dependencies
• My PR includes TypeDoc comments for all new (or modified) public methods and classes. It also includes TypeDoc for large or complex private methods.
• My PR passes all specs/tests and includes new/updated specs or tests based on the Code Testing Guide.
• If my PR includes new, third-party dependencies (in package.json), I've made sure their licenses align with the DSpace BSD License based on the Licensing of Contributions documentation.

[atarix83]

thanks @bruno-atmire for this PR.
I've verified that it resolves the annoying bug