Fix index of keepEndPos parameter

PiperOrigin-RevId: 864745710

Author: cushon

core/src/main/java/com/google/googlejavaformat/java/Trees.java

@@ -229,7 +229,7 @@ private static MethodHandle getNewParserHandle() {
                 "newParser",
                 MethodType.methodType(
                     JavacParser.class, CharSequence.class, boolean.class, boolean.class)),
-            2,
+            3,
             boolean.class);
       } catch (ReflectiveOperationException e) {
         throw new LinkageError(e.getMessage(), e);