Remove internal visibility suppressions in kotlin.test

Internal visibility works fine in MPP, so they are no longer required.

libraries/kotlin.test/common/src/test/kotlin/kotlin/test/tests/BasicAssertionsTest.kt

@@ -197,7 +197,6 @@ private fun checkFailedAssertion(assertion: () -> Unit) {
     assertFailsWith<AssertionError> { withDefaultAsserter(assertion) }
 }
 
-@Suppress("INVISIBLE_MEMBER")
 private fun withDefaultAsserter(block: () -> Unit) {
     val current = overrideAsserter(DefaultAsserter)
     try {