org_settings: Add collapse/show settings button for users and guests.

For non-admins some organisation settings tabs are 'collapsed' by default.
A button at the bottom of these settings can be used to toggle
show/collapse for these settings tabs.

Resolves #12313.

static/js/click_handlers.js

@@ -469,6 +469,9 @@ exports.initialize = function () {
         }, 300);
     });
 
+    $("#settings_page").on("click", ".collapse-settings-btn", function () {
+        settings_toggle.toggle_org_setting_collapse();
+    });
 
     // COMPOSE