drop deprecated syntax for class objects

idea/testData/quickfix/migration/afterClassObjectToDefaultSingle.kt

@@ -1,7 +0,0 @@
-// "Replace 'class' keyword with 'companion' modifier" "true"
-
-class A {
-    public companion object {
-
-    }
-}

idea/testData/quickfix/migration/beforeClassObjectToDefaultSingle.kt

@@ -1,7 +0,0 @@
-// "Replace 'class' keyword with 'companion' modifier" "true"
-
-class A {
-    public class<caret> object {
-
-    }
-}

idea/testData/quickfix/migration/classObjectToDefaultMultiple.after.data.Sample.kt

@@ -1,29 +0,0 @@
-class D {
-    companion public object Named {
-
-    }
-}
-
-trait H {
-    companion object {
-
-    }
-}
-
-class E {
-    companion object {
-        class D {
-            companion object {
-                class D {
-                    companion object
-                }
-            }
-        }
-    }
-}
-
-class K {
-    companion object Companion
-
-    class Object
-}

idea/testData/quickfix/migration/classObjectToDefaultMultiple.after.kt

@@ -1,19 +0,0 @@
-// "Replace 'class' keyword with 'companion' modifier in whole project" "true"
-
-class A {
-    public companion object {
-
-    }
-}
-
-class B {
-    companion object {
-
-    }
-}
-
-class C {
-    companion object Named {
-
-    }
-}

idea/testData/quickfix/migration/classObjectToDefaultMultiple.before.Main.kt

@@ -1,19 +0,0 @@
-// "Replace 'class' keyword with 'companion' modifier in whole project" "true"
-
-class A {
-    public class<caret> object {
-
-    }
-}
-
-class B {
-    class object {
-
-    }
-}
-
-class C {
-    class object Named {
-
-    }
-}

idea/testData/quickfix/migration/classObjectToDefaultMultiple.before.data.Sample.kt

@@ -1,29 +0,0 @@
-class D {
-    companion public class object Named {
-
-    }
-}
-
-trait H {
-    companion class object {
-
-    }
-}
-
-class E {
-    class object {
-        class D {
-            class object {
-                class D {
-                    class object
-                }
-            }
-        }
-    }
-}
-
-class K {
-    companion object Companion
-
-    class Object
-}