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

plugins/android-compiler-plugin/testData/codegen/android/multiFile/0.kt

@@ -8,7 +8,7 @@ import kotlinx.android.synthetic.layout1.*
 
 class R {
     class id {
-        class object {
+        default object {
             val item_detail_container = 0
             val textView1 = 1
             val password = 2

plugins/android-compiler-plugin/testData/codegen/android/multiFile/1.kt

@@ -8,7 +8,7 @@ import kotlinx.android.synthetic.layout1.*
 
 class R {
     class id {
-        class object {
+        default object {
             val item_detail_container = 0
             val textView1 = 1
             val password = 2