g-t-e: mark 'new_file' test as fatal

The tests after it assume new_file ran - they rely on the file
it creates - so it should be considered fatal.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

tests/applications/gnome-text-editor/new_file.pm

@@ -55,7 +55,7 @@ sub run {
 
 
 sub test_flags {
-    return {milestone => 1};
+    return {fatal => 1, milestone => 1};
 }
 
 1;