popovers: Use keys instead of names for tab navigation in profile modal.

We used name parameter in tab component callback to handle our
custom logic when switching tabs in profile modal. Using name
here invites a posible bug as these name are tagged for
translation. So to avoid this we switch to use key (html id
for these tabs) for this as they are always constant.

static/js/popovers.js

@@ -431,11 +431,11 @@ export function show_user_profile(user) {
         callback(name, key) {
             $(".tabcontent").hide();
             $("#" + key).show();
-            switch (name) {
-                case "User groups":
+            switch (key) {
+                case "groups-tab":
                     render_user_group_list(groups_of_user, user);
                     break;
-                case "Streams":
+                case "streams-tab":
                     render_user_stream_list(user_streams, user);
                     break;
             }