console.lua: don't clear not ours osd messages

Note that this still is not perfect, because if osd message is changed,
console cannot know about it and would still clear it, but this change
make it at least not do it to every message even if console is not used.

player/lua/console.lua

@@ -414,7 +414,9 @@ end
 local function print_to_terminal()
     -- Clear the log after closing the console.
     if not repl_active then
-        mp.osd_message('')
+        if osd_msg_active then
+            mp.osd_message('')
+        end
         osd_msg_active = false
         return
     end