default -> companion: replace all mentions of default and default object

compiler/testData/loadJava/compiledKotlin/enum/innerEnumExistingClassObject.kt

@@ -1,7 +1,7 @@
 package test
 
 class A {
-    default object { }
+    companion object { }
     enum class E {
         ENTRY
     }

compiler/testData/loadJava/compiledKotlin/enum/innerEnumExistingClassObject.txt

@@ -3,8 +3,8 @@ package test
 internal final class A {
     /*primary*/ public constructor A()
 
-    internal default object Default {
-        /*primary*/ private constructor Default()
+    internal companion object Companion {
+        /*primary*/ private constructor Companion()
     }
 
     internal final enum class E : kotlin.Enum<test.A.E> {