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

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

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

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

@@ -4,7 +4,7 @@ class ClassWithClassObject {
     fun f() {
     }
 
-    default object {
+    companion object {
         fun f() {
         }
 

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

@@ -4,5 +4,5 @@
 package test
 
 public final class DependencyOnNestedClasses() : dependency.D.Nested {
-    internal final fun f(nc: dependency.D.Default.NestedInClassObject, i: dependency.D.Inner, ii: dependency.D.Inner.Inner, nn: dependency.D.Nested.Nested): dependency.D.Nested { /* compiled code */ }
+    internal final fun f(nc: dependency.D.Companion.NestedInClassObject, i: dependency.D.Inner, ii: dependency.D.Inner.Inner, nn: dependency.D.Nested.Nested): dependency.D.Nested { /* compiled code */ }
 }

idea/testData/decompiler/decompiledText/DependencyOnNestedClasses/Dependency.kt

@@ -8,7 +8,7 @@ class D {
         class Nested
     }
 
-    default object {
+    companion object {
         class NestedInClassObject
     }
 }

idea/testData/decompiler/decompiledText/DependencyOnNestedClasses/DependencyOnNestedClasses.kt

@@ -3,7 +3,7 @@ package test
 import dependency.*
 
 public class DependencyOnNestedClasses : D.Nested() {
-    fun f(nc: D.Default.NestedInClassObject, i: D.Inner, ii: D.Inner.Inner, nn: D.Nested.Nested): D.Nested {
+    fun f(nc: D.Companion.NestedInClassObject, i: D.Inner, ii: D.Inner.Inner, nn: D.Nested.Nested): D.Nested {
         return D.Nested()
     }
 }