move to inner: do not raise a conflict when move class with private inner class (IDEA-104986)

java/java-tests/testData/refactoring/moveClassToInner/innerInsideMoved/before/pack1/Class1.java

@@ -0,0 +1,6 @@
+package pack1;
+
+public class Class1 {
+  class Inner {}
+  Inner i;
+}

java/java-tests/testData/refactoring/moveClassToInner/innerInsideMoved/before/pack2/A.java

@@ -0,0 +1,4 @@
+package pack2;
+
+public class A {
+}

java/java-tests/testData/refactoring/moveClassToInner/innerInsideMoved/before/packUser/Class2.java

@@ -0,0 +1,7 @@
+package packUser;
+
+import pack1.Class1;
+
+public class Class2 {
+  Class1 myClass1;
+}