plugin XEP-0277: revert use of expandNewLinesToXHTML for incoming messages:

- this was here for retro-compatibility with messages previously posted from Libervia
    - but this is not appropriate and will add some extra <br /> e.g. in messages from Movim

src/plugins/plugin_xep_0277.py

@@ -184,7 +184,6 @@ class XEP_0277(object):
                 data = xml_tools.decapsulateDomishContent(data_elt)
 
                 microblog_data[key] = yield self.host.plugins["TEXT-SYNTAXES"].clean_xhtml(data)
-                microblog_data[key] = xml_tools.expandNewLinesToXHTML(microblog_data[key])
             else:
                 key = check_conflict(elem.name)
                 microblog_data[key] = unicode(elem)