change wording of platform admin toggle to positive rather than negative

CHS Approved Wording 👍

also rename suppress_platform_admin -> disable_platform_admin_view in
the backend, as suppress is a kinda weird word.

app/templates/views/user-profile/disable-platform-admin-view.html

@@ -5,7 +5,7 @@
 {% from "components/radios.html" import radios %}
 
 {% block per_page_title %}
-  Suppress platform admin view
+  Use platform admin view
 {% endblock %}
 
 {% block maincolumn_content %}
@@ -13,7 +13,7 @@
   <div class="grid-row">
     <div class="column-five-sixths">
       {{ page_header(
-        'Suppress platform admin',
+        'Use platform admin view',
         back_link=url_for('.user_profile')
       ) }}