Remove focus when closing the chat window via the escape key.

This was SVN commit r12467.

binaries/data/mods/public/gui/session/menu.js

@@ -179,6 +179,7 @@ function openChat()
 function closeChat()
 {
 	getGUIObjectByName("chatInput").caption = ""; // Clear chat input
+	getGUIObjectByName("chatInput").blur(); // Remove focus
 	getGUIObjectByName("chatDialogPanel").hidden = true;
 }