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

compiler/testData/writeFlags/property/classObject/trait/delegatedProtectedVar.kt

@@ -9,7 +9,7 @@ class TestDelegate() {
 }
 
 trait Test {
-  default object {
+  companion object {
     protected var prop: Int by TestDelegate()
   }
 }
@@ -19,11 +19,11 @@ trait Test {
 // ABSENT: TRUE
 
 // TESTED_OBJECT_KIND: property
-// TESTED_OBJECTS: Test$Default, prop
+// TESTED_OBJECTS: Test$Companion, prop
 // ABSENT: TRUE
 
 // TESTED_OBJECT_KIND: property
-// TESTED_OBJECTS: Test$Default, prop$delegate
+// TESTED_OBJECTS: Test$Companion, prop$delegate
 // FLAGS: ACC_FINAL, ACC_PRIVATE
 
 // TESTED_OBJECT_KIND: property