Fix item-level statistics pages

[YanaDePauw]

References

Fixes #1116

Description

This PR fixes the issue with navigating to the statistics page from an item where the user got redirected to the item page instead of going to the statistics page.

Instructions for Reviewers

• Navigate to an item page
• Click on the Statistics button in the navigation bar
• Verify that you are navigated to the statistics page of the provided item.

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.

[lgtm-com]

This pull request introduces 9 alerts when merging 6631980 into a87bf00 - view on LGTM.com

new alerts:

• 9 for Unused variable, import, function or class

[tdonohue]

@YanaDePauw : The code here looks good & it fixes the bug. However, I was a little surprised to see no specs/tests in this PR. Is there any way we could add a spec or two to make sure this same sort of problem doesn't happen again later? (If for some reason that's overly complex we could add a ticket for this...but I'm hoping it's simple enough to add to this PR)

[lgtm-com]

This pull request introduces 1 alert when merging 926dd46 into 68bd8d4 - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class

[lgtm-com]

This pull request introduces 1 alert when merging 579f98d into 68bd8d4 - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class

[tdonohue]

👍 Thanks @YanaDePauw for adding some new e2e tests here. This all looks good now!