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

compiler/testData/diagnostics/tests/classObjects/resolveFunctionInsideClassObject.kt

@@ -3,7 +3,7 @@ package test
 class Test {
   fun test(): Int = 12
 
-  default object {
+  companion object {
     val a = <!INACCESSIBLE_OUTER_CLASS_EXPRESSION!>test()<!> // Check if resolver will be able to infer type of a variable
   }
 }