Fix usages of IGNORE_BACKEND_WITHOUT_CHECK

idea/testData/decompiler/decompiledText/SecondaryConstructors/SecondaryConstructors.kt

@@ -1,7 +1,5 @@
 package test
 
-import java.io.Serializable
-
 class SecondaryConstructors(x: Boolean) {
     init {
     }
@@ -15,7 +13,7 @@ class SecondaryConstructors(x: Boolean) {
     private constructor(x: Int) : this(x < 0) {
     }
 
-    inner class Inner<T : String, G : Int> where G : Serializable {
+    inner class Inner<T : String, G : Int> where G : Comparable<Int> {
         constructor(x: T, g: G) {
         }
     }

idea/testData/decompiler/decompiledText/SecondaryConstructors/directives.txt

@@ -1,4 +0,0 @@
-// TODO Remove this restriction when secondary constructors will be supported in js backend.
-// See KT-7798 JS: add support for secondary constructors
-// https://youtrack.jetbrains.com/issue/KT-7798
-// IGNORE_BACKEND_WITHOUT_CHECK: JS