Remove reference to System.out.println from test.

This makes the test usable for non-jvm targets as well.

compiler/testData/codegen/box/controlStructures/forUserType.kt

@@ -1,10 +1,3 @@
-// IGNORE_BACKEND: WASM
-// WASM_MUTE_REASON: IGNORED_IN_JS
-// IGNORE_BACKEND: JS_IR
-// IGNORE_BACKEND: JS_IR_ES6
-// TODO: muted automatically, investigate should it be ran for JS or not
-// IGNORE_BACKEND: JS, NATIVE
-
 fun box() : String {
     var sum : Int = 0
     var i = 0
@@ -70,7 +63,6 @@ fun box() : String {
     for (el in b) {
         sum = sum + (el ?: 0)
     }
-    System.out?.println(sum)
     if(sum != 10) return "b failed"
 
     return "OK"