Fix check file

Author: odersky

tests/printing/i620.check

@@ -5,7 +5,7 @@ package O {
       class C() extends Object() {
         protected[D] def a: Int = 0
         private[D] def b: Int = 0
-        private def c: Int = 0
+        private[this] def c: Int = 0
         protected def d: Int = 0
         private[A] def e: Int = 0
         protected[A] def f: Int = 0
@@ -14,15 +14,15 @@ package O {
         def (c: D.this.C) g1: Int = 0
       }
       private[D] class E() extends Object() {}
-      private class F() extends Object() {}
+      private[this] class F() extends Object() {}
       private[A] class G() extends Object() {}
       protected[D] class H() extends Object() {}
       protected class I() extends Object() {}
       protected[A] class J() extends Object() {}
       class K() extends Object() {}
       protected[D] val a: Int = 0
       private[D] val b: Int = 0
-      private val c: Int = 0
+      private[this] val c: Int = 0
       protected val d: Int = 0
       private[A] val e: Int = 0
       protected[A] val f: Int = 0