Java to Kotlin converter: no explicit type for private and internal fields when possible

j2k/tests/testData/ast/staticMembers/PrivateStaticMembers.kt

@@ -6,7 +6,7 @@ class A() {
     }
 
     class object {
-        private val s: String = "abc"
+        private val s = "abc"
 
         private fun privateStatic1() {
         }