Minor. Use more granular assertion levels in assertion tests

compiler/testData/codegen/box/assert/jvm/interfaceAssertionsDisabled.kt

@@ -4,6 +4,8 @@
 // KOTLIN_CONFIGURATION_FLAGS: ASSERTIONS_MODE=jvm
 // WITH_RUNTIME
 
+package interfaceAssertionsDisabled
+
 interface Checker {
     fun checkTrue(): Boolean {
         var hit = false
@@ -40,9 +42,8 @@ class Dummy
 
 fun disableAssertions(): Checker {
     val loader = Dummy::class.java.classLoader
-    loader.setDefaultAssertionStatus(false)
-    val c = loader.loadClass("ShouldBeDisabled")
-    return c.newInstance() as Checker
+    loader.setPackageAssertionStatus("interfaceAssertionsDisabled", false)
+    return loader.loadClass("interfaceAssertionsDisabled.ShouldBeDisabled").newInstance() as Checker
 }
 
 fun box(): String {
@@ -51,6 +52,5 @@ fun box(): String {
     if (c.checkTrueWithMessage()) return "FAIL 1"
     if (c.checkFalse()) return "FAIL 2"
     if (c.checkFalseWithMessage()) return "FAIL 3"
-
     return "OK"
 }