extract method object: do not make static when already static (IDEA-98290)

java/java-tests/testData/refactoring/extractMethodObject/multipleExitPoints/FromStaticContext.java

@@ -0,0 +1,12 @@
+class Bag {
+    Integer x;
+    Integer y;
+}
+
+class Foo {
+    public static void foo() {
+        Bag b = new Bag();
+        System.out.println(<selection>b</selection>.x);
+        System.out.println(b.x);
+    }
+}

java/java-tests/testData/refactoring/extractMethodObject/multipleExitPoints/FromStaticContext.java.after

@@ -0,0 +1,24 @@
+class Bag {
+    Integer x;
+    Integer y;
+}
+
+class Foo {
+    public static void foo() {
+        Bag b = new Bag();
+        System.out.println(new Inner(b).invoke().x);
+        System.out.println(new Inner(b).invoke().x);
+    }
+
+    private static class Inner {
+        private Bag b;
+
+        public Inner(Bag b) {
+            this.b = b;
+        }
+
+        public Bag invoke() {
+            return b;
+        }
+    }
+}