update: add suitable icon to rocketchat tab

src/views/partials/menu-left.pug

@@ -102,7 +102,7 @@ solid-router#navbar-router(default-route=defaultRoute)
       if component.type == "rocketchat"
         solid-route.menu-tab.segment.full.padding-xsmall.text-semibold.text-color-white.heading-active.bg-color-heading.transparent-background.hover.active(name=component.route)
           div.segment.margin-right-xxsmall
-            div.segment.icon.icon-small.icon-briefcase
+            div.segment.icon.icon-small.ci-chat
           div.segment.text-uppercase.text-letter-spacing-large(data-trans="menuLeft.rocketchat")
         div.divider
       if component.type == "projects"