Replace 'class object' with 'default object' in renderers and test data

Includes changes to decompiled text
Old syntax is used in builtins and project code for now

compiler/testData/psi/annotation/ShortAnnotations.kt

@@ -9,7 +9,7 @@ foo bar(1) buzz<T>(1) zoo typealias T = Int
 
 
 class Foo {
-  foo bar(1) buzz<T>(1) zoo class object {}
+  foo bar(1) buzz<T>(1) zoo default object {}
   foo bar(1) buzz<T>(1) zoo class A
   foo bar(1) buzz<T>(1) zoo object B
   foo bar(1) buzz<T>(1) zoo fun a() {}

compiler/testData/psi/annotation/ShortAnnotations.txt

@@ -474,8 +474,8 @@ JetFile: ShortAnnotations.kt
                 USER_TYPE
                   REFERENCE_EXPRESSION
                     PsiElement(IDENTIFIER)('zoo')
-        PsiWhiteSpace(' ')
-        PsiElement(class)('class')
+          PsiWhiteSpace(' ')
+          PsiElement(default)('default')
         PsiWhiteSpace(' ')
         PsiElement(object)('object')
         PsiWhiteSpace(' ')