parse.y: fix literal symbol list node type
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48484 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
parse.y: fix literal symbol list node type
with no interpolation. [ruby-core:66343]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48484 b2dd03c8-39d4-4d8f-98ff-823fe69b080e