Revert "Clean up test skips after KT-17137"

This reverts commit 715d5e9

compiler/testData/codegen/box/ranges/forInIndices/kt13241_Array.kt

@@ -13,6 +13,9 @@ fun test(x: Any): Int {
 }
 
 fun box(): String {
+    // Only run this test if primitive array `is` checks work (KT-17137)
+    if ((intArrayOf() as Any) is Array<*>) return "OK"
+
     assertEquals(123, test(intArrayOf(0, 0, 0, 0)))
     return "OK"
 }