fix antlr lexer

Author: parrt

java/grammars/org/antlr/codebuff/ANTLRv4Lexer.g4

@@ -75,14 +75,7 @@ tokens {
 
 	@Override
 	public Token emit() {
-		if (_type == ID) {
-			String firstChar = _input.getText(Interval.of(_tokenStartCharIndex, _tokenStartCharIndex));
-			if (Character.isUpperCase(firstChar.charAt(0))) {
-				_type = TOKEN_REF;
-			} else {
-				_type = RULE_REF;
-			}
-
+		if (_type == TOKEN_REF || _type==RULE_REF ) {
 			if (_currentRuleType == Token.INVALID_TYPE) { // if outside of rule def
 				_currentRuleType = _type;                 // set to inside lexer or parser rule
 			}