Add missing trailing slashes

Missing slashes lead to redirects that add the slash. Add where missing
in the context menu.

Author: df7cb

pgweb/util/contexts.py

@@ -76,18 +76,18 @@
         {'title': 'Report a Bug', 'link': '/account/submitbug/'},
     ],
     'account': [
-        {'title': 'Your account', 'link': '/account'},
-        {'title': 'Profile', 'link': '/account/profile'},
+        {'title': 'Your account', 'link': '/account/'},
+        {'title': 'Profile', 'link': '/account/profile/'},
         {'title': 'Mailing List Subscriptions', 'link': 'https://lists.postgresql.org/manage/'},
-        {'title': 'Submitted data', 'link': '/account', 'submenu': [
+        {'title': 'Submitted data', 'link': '/account/', 'submenu': [
             {'title': 'News Articles', 'link': '/account/edit/news/'},
             {'title': 'Events', 'link': '/account/edit/events/'},
             {'title': 'Products', 'link': '/account/edit/products/'},
             {'title': 'Professional Services', 'link': '/account/edit/services/'},
             {'title': 'Organisations', 'link': '/account/edit/organisations/'},
         ]},
         {'title': 'Change password', 'link': '/account/changepwd/'},
-        {'title': 'Logout', 'link': '/account/logout'},
+        {'title': 'Logout', 'link': '/account/logout/'},
     ],
 }