make method static: do not pass class param for static inner class (IDEA-90720)

java/java-tests/testData/refactoring/makeMethodStatic/beforeInnerStaticClassUsed.java

@@ -0,0 +1,7 @@
+class C {
+  private void f<caret>oo() {
+    Bar bar = new Bar();
+  }
+  
+  static class Bar {}
+}