Remove obsolete test for KT-1131

libraries/stdlib/test/StdLibIssuesTest.kt

-package test.stdlib.issues
-
-import kotlin.test.*
-import org.junit.Test as test
-
-private fun listDifference<T>(first : List<T>, second : List<T>) : List<T> {
-    return first.filter{ !second.contains(it) }.toList()
-}
-
-class StdLibIssuesTest {
-
-    @test fun test_KT_1131() {
-        val data = arrayListOf("blah", "foo", "bar")
-        val filterValues = arrayListOf("bar", "something", "blah")
-
-        expect(arrayListOf("foo")) {
-            val answer = listDifference(data, filterValues)
-            println("Found answer ${answer}")
-            answer
-        }
-    }
-
-}