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

idea/testData/completion/injava/ClassObject.java

@@ -1,6 +1,6 @@
 public class Testing {
     public static void test() {
-        mockLib.foo.LibClass.Default.<caret>
+        mockLib.foo.LibClass.Companion.<caret>
     }
 }
 

idea/testData/completion/injava/ClassObjectField.java

@@ -4,5 +4,5 @@ public class Testing {
     }
 }
 
-// EXIST: Default
+// EXIST: Companion
 // EXIST: OBJECT$

idea/testData/completion/injava/NestedObjectInstance.java

@@ -1,6 +1,6 @@
 public class Testing {
     public static void test() {
-        mockLib.foo.LibClass.Default.NestedObject.<caret>
+        mockLib.foo.LibClass.Companion.NestedObject.<caret>
     }
 }
 

idea/testData/completion/injava/ObjectInClassObjects.java

@@ -1,5 +1,5 @@
 public class Testing {
-    public static void test(mockLib.foo.F.Default.F.Default.<caret>) {
+    public static void test(mockLib.foo.F.Companion.F.Companion.<caret>) {
     }
 }
 

idea/testData/completion/injava/mockLib/main.kt

@@ -4,7 +4,7 @@ public class LibClass {
     public fun foo() {
     }
 
-    default object {
+    companion object {
         fun classObjectFun() {
         }
 
@@ -40,9 +40,9 @@ public fun String.topLevelExtFunction(): String = ""
 public var topLevelVar: String = ""
 
 class F() {
-    default object {
+    companion object {
         class F {
-            default object {
+            companion object {
                 object F {
                 }
             }