user_card_popover: Display bot's role in bot user card popover.

As a follow-up to the previous commit which repositions the bot owner
field, this commit adds the bot's role in the format "Bot ({role})" to
the previous position of the bot owner field in the bot user card.

web/templates/popovers/user_card/user_card_popover.hbs

@@ -18,7 +18,7 @@
                     {{#if is_system_bot}}
                         <div>{{t "System bot" }}</div>
                     {{else}}
-                        <div>{{t "Bot" }}</div>
+                        <div>{{t "Bot ({user_type})" }}</div>
                     {{/if}}
                 {{else}}
                     <div>{{ user_type }}</div>