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

compiler/testData/codegen/box/staticFields/anonymousInitializerInClassObject.kt

@@ -1,5 +1,5 @@
 class Foo {
-    default object {
+    companion object {
         val bar: String
 
         {

compiler/testData/codegen/box/staticFields/incInClassObject.kt

@@ -1,6 +1,6 @@
 
 class A {
-    default object {
+    companion object {
         private var r: Int = 1;
 
         fun test(): Int {

compiler/testData/codegen/box/staticFields/inheritedPropertyInClassObject.kt

@@ -1,6 +1,6 @@
 open class Bar<T>(val prop: String)
 class Foo {
-    default object : Bar<Foo>("OK") {
+    companion object : Bar<Foo>("OK") {
         val p = Foo.prop
         val p2 = prop
         val p3 = this.prop