feat(ticket): quitar icono duplicado junto a pestañas Mensajes/Correos

frontend/src/app/(app)/tickets/[id]/page.tsx

@@ -592,7 +592,6 @@ export default function TicketDetailPage() {
         <div className="col-lg-8">
           <div className="card mb-4">
             <div className="card-header d-flex align-items-center gap-2 flex-wrap">
-              <i className="bi bi-chat-dots" style={{ color: "var(--primary)" }}></i>
               <ul className="nav nav-tabs card-header-tabs border-0" role="tablist">
                 <li className="nav-item" role="presentation">
                   <button