Fixed incorrect trim usage

Author: rafaelrpinto

src/core/Formatter.js

@@ -189,7 +189,7 @@ export default class Formatter {
     }
 
     formatQuerySeparator(token, query) {
-        return trimEnd(query) + token.value + "\n";
+        return this.trimTrailingWhitespace(query) + token.value + "\n";
     }
 
     addNewline(query) {

test/StandardSqlFormatterTest.js

@@ -358,7 +358,8 @@ describe("StandardSqlFormatter", function() {
             "SELECT\n" +
             "  a\n" +
             "FROM\n" +
-            "  b --comment;"
+            "  b --comment\n" +
+            ";"
         );
     });