Fix reflection class lookup in default package

Do not append "." to the name of the class in the default package.

compiler/testData/codegen/box/reflection/annotations/onTypes/arrayTypeInDefaultPackage.kt

@@ -0,0 +1,20 @@
+// TARGET_BACKEND: JVM
+// WITH_REFLECT
+
+import kotlin.reflect.KClass
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
+
+annotation class Nested(val value: String)
+
+@Target(AnnotationTarget.TYPE)
+annotation class Anno(
+    val aa: Array<Nested>,
+)
+
+fun f(): @Anno([Nested("OK")]) Unit {}
+
+fun box(): String {
+    val anno = ::f.returnType.annotations.single() as Anno
+    return anno.aa[0].value
+}