invert if: fix psi replacement (IDEA-174966)

java/java-tests/testData/codeInsight/invertIfCondition/afterNestedIf5.java

@@ -0,0 +1,14 @@
+// "Invert 'if' condition" "true"
+class Main {
+    Object foo(boolean b1, boolean b2) {
+        if (b1) {
+            return null;
+        } else {
+            if (b2) {
+                return null;
+            }
+            return "a";
+        }
+
+    }
+}