TelnetServer: Use fallible version of StringBuilder::to_byte_buffer

Author: https://github.com/karolba
Commit: 058cc00837
Pull-request: https://github.com/SerenityOS/serenity/pull/17746
Reviewed-by: https://github.com/kleinesfilmroellchen ✅
Reviewed-by: https://github.com/linusg

Userland/Services/TelnetServer/Client.cpp

@@ -182,7 +182,7 @@ ErrorOr<void> Client::send_data(StringView data)
         }
     }
 
-    auto builder_contents = builder.to_byte_buffer();
+    auto builder_contents = TRY(builder.try_to_byte_buffer());
     TRY(m_socket->write(builder_contents));
     return {};
 }