Remove dead code related to showing bots.

(The dead code made sense in the very early phases of sketching out
the feature, but it's no longer executed.)

(imported from commit 464145f227ddb25f0554bbbade0b0e3e0e399bc3)

zephyr/static/js/settings.js

@@ -5,11 +5,7 @@ var exports = {};
 function add_bot_row(name, email, avatar_url, api_key) {
     var avatar_cell;
 
-    if (avatar_url) {
     avatar_cell = $('<img>').attr('src', avatar_url).attr('class', 'avatar');
-    } else {
-        avatar_cell = '(default)';
-    }
 
     var row = $('<tr></tr>').append($('<td>').text(name),
                                     $('<td>').text(email),