Removed unused template file

ECOM-4729

lms/templates/api_admin/catalogs/detail.html

-## mako
-<%page expression_filter="h"/>
-<%inherit file="../../main.html"/>
-<%!
-from django.core.urlresolvers import reverse
-from django.utils.translation import ugettext as _
-%>
-
-<%block name="pagetitle">${catalog.name}</%block>
-
-<%block name="content">
-<div id="api-access-wrapper">
-  <h1 id="api-header">${catalog.name}</h1>
-  <p class="api-copy-body">${catalog.query}</p>
-  <p class="api-copy-body"><a href="${edit_link}">${_("Edit or delete this catalog.")}</a></p>
-  <p class="api-copy-body"><a href="${preview_link}">${_("See a preview of this catalog's contents.")}</a></p>
-</div>
-</%block>