keycontrol: do not use operator>>(video_desc)

Similarly as in previous codec - parsing to std::string and then printing
back is unnecessary. Consider rather removing the operator>>.

Author: MartinPulec

src/keyboard_control.cpp

@@ -775,15 +775,12 @@ void keyboard_control::impl::info()
 	}
 
 	{
-		struct video_desc desc{};
                 struct msg_universal *m = (struct msg_universal *) new_message(sizeof(struct msg_universal));
                 strcpy(m->text, "get_format");
                 struct response *r = send_message_sync(m_root, "receiver.decoder", (struct message *) m, 100,  SEND_MESSAGE_FLAG_QUIET | SEND_MESSAGE_FLAG_NO_STORE);
                 if (response_get_status(r) == RESPONSE_OK) {
-                        const char *text = response_get_text(r);
-                        istringstream iss(text);
-                        iss >> desc;
-                        col() << TBOLD("Received video format: ") <<  desc << "\n";
+                        col() << TBOLD("Received video format: ")
+                              << response_get_text(r) << "\n";
                 }
                 free_response(r);
 	}

src/video.cpp

@@ -164,6 +164,12 @@ std::ostream& operator<<(std::ostream& os, const codec_t& color_spec)
         return os;
 }
 
+/**
+ * currently unused (except of the unit test
+ * misc_test_video_desc_io_op_symmetry())
+ *
+ * the removal can be considered
+ */
 std::istream& operator>>(std::istream& is, video_desc& desc)
 {
         video_desc out;