KT-5287 J2K: Convert class with private constructor and static functions to "object" instead of class with "class object"

#KT-5287 Fixed

j2k/testData/fileOrElement/class/utilityClass2.java

@@ -0,0 +1,8 @@
+class Util {
+    private Util(){}
+
+    public static void util1() {}
+    public static void util2() {}
+
+    public static final int CONSTANT = 10;
+}