This code is not needed and breaks tests

This code was disabled in Perl binding for breaking tests.

Kirill said on IRC:

< rz> ingy: i'm not sure why i set open_ended in yaml_emitter_write_plain_scalar

src/emitter.c

@@ -1946,10 +1946,6 @@
 
     emitter->whitespace = 0;
     emitter->indention = 0;
-    if (emitter->root_context)
-    {
-        emitter->open_ended = 1;
-    }
 
     return 1;
 }