Companion objects have public visibility by default

#KT-7114 Fixed

idea/testData/decompiler/decompiledText/ClassWithClassObject.expected.kt

@@ -4,7 +4,7 @@
 package test
 
 internal final class ClassWithClassObject public constructor() {
-    internal companion object {
+    public companion object {
         internal final val a: test.A /* compiled code */
 
         public final var b: test.B /* compiled code */

idea/testData/decompiler/decompiledText/Enum.expected.kt

@@ -16,7 +16,7 @@ internal final enum class Enum private constructor() : kotlin.Enum<test.Enum> {
 
     F
 
-    internal companion object {
+    public companion object {
         internal final val c: kotlin.Int /* compiled code */
     }