[Test] Update testdata of quickfix tests related to sealed classes

idea/testData/quickfix/implement/sealedEmpty.kt.after

@@ -1,6 +1,5 @@
 // "Implement sealed class" "true"
 // SHOULD_BE_AVAILABLE_AFTER_EXECUTION
 
-sealed class Sealed {
-    class SealedImpl : Sealed()
-}
+sealed class Sealed
+class SealedImpl : Sealed()