DEV-925: update switch role link

[carylwyatt]

Problem

When in catalog (or website), if user chooses to switch roles via the navbar login/account button, the user is sent back to the website homepage instead of the page they were on.

Fix

/components/Navbar/index.js (line 434)

 href="//{`${
                          HT.service_domain
                        }/cgi/ping/switch?target=${encodeURIComponent(
                          window.location.href
                        )}`}"

I borrowed the code from Roger's logout redirect just below this in the same file.

babel-local-dev doesn't have ping (or at least mine doesn't), so I tested this on https://dev-3.catalog.hathitrust.org/Search/Home

Test it

Conduct search, open catalog record, log in and switch role to CAA-- you should be redirected back to the page you were on.

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