LUCENE-5357: Sync small change (/Katakana/ => /Katakana [x ExtendNumLet] x Katakana/ in the <ALPHANUM> pattern) from UAX29URLEmailTokenizerImpl.jflex to StandardTokenizerImpl.jflex

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1548746 13f79535-47bb-0310-9956-ffa450edef68