[xdg-desktop-portal-gnome] external-window: Remove newline from warning

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit fd32c6f598e296dc5a451679bec95178e0499182
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Fri Aug 13 15:57:24 2021 -0300

    external-window: Remove newline from warning
    
    g_warning already newlines every message

 src/externalwindow.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/externalwindow.c b/src/externalwindow.c
index 84130c8..f4a964d 100644
--- a/src/externalwindow.c
+++ b/src/externalwindow.c
@@ -75,7 +75,7 @@ create_external_window_from_handle (const char *handle_str)
     }
 #endif
 
-  g_warning ("Unhandled parent window type %s\n", handle_str);
+  g_warning ("Unhandled parent window type %s", handle_str);
   return NULL;
 }