movieplayer: add send message CRCInput::RC_info on changed position

Sends message to show info bar on change position, maybe there is
a better solution (e.g. with callback), but this should help to visualize if position
was changed, e.g.: user has pressed number keys for minute steps.
In my opinion, this feature is missing for better user interaction.

src/gui/movieplayer.cpp

@@ -1610,6 +1610,10 @@ bool CMoviePlayerGui::SetPosition(int pos, bool absolute)
 		speed = 1;
 		playback->SetSpeed(speed);
 	}
+
+	if (res)
+		g_RCInput->postMsg(CRCInput::RC_info, 0);
+
 	return res;
 }