Fix incorrect links on /government/get-involved

These links were incorrect, presumably they are an artefact from what
was used to copy+paste from originally.

Interestingly these links actually have explicit tests in Smokey [1].
But it turns out they don't actually test correctly as they don't have
an expect step [2].

As it is quite unusual to test at the fidelity of individual links in
HTML (they're just testing you typed the same thing afterall) I've not
added replacement tests.

[1]: https://github.com/alphagov/smokey/blob/7553a432259d785fb6d4fb81cfd4fe3572185ad3/features/apps/government_frontend.feature#L23-L47
[2]: https://github.com/alphagov/smokey/blob/7553a432259d785fb6d4fb81cfd4fe3572185ad3/features/step_definitions/get_involved_page_steps.rb#L39-L41

app/views/content_items/get_involved.html.erb

@@ -53,14 +53,14 @@
         <%= render "govuk_publishing_components/components/big_number", {
           number: @open_consultation_count,
           label: t('get_involved.open_consultations'),
-          href: "/government/organisations#ministerial_departments"
+          href: "/search/policy-papers-and-consultations?content_store_document_type=open_consultations"
         } %>
       </div>
       <div class="govuk-grid-column-two-thirds">
         <%= render "govuk_publishing_components/components/big_number", {
           number: @closed_consultation_count,
           label: t('get_involved.closed_consultations'),
-          href: "/government/organisations#ministerial_departments"
+          href: "/search/policy-papers-and-consultations?content_store_document_type=closed_consultations"
         } %>
       </div>
     </div>