Fix trailing tab after qna questions is not recognized issue (#1008)

* fix trailing tab is not recognized in qna questions

* trigger CI

Author: feich-ms

packages/lu/src/parser/lufile/LUFileLexer.g4

@@ -231,5 +231,5 @@ NEWLINE_IN_QNA
   ;
 
 QNA_TEXT
-  : ~[\t\r\n]+
+  : ~[\r\n]+
   ;