Minor, improve test on unexported package in Java module

Add Kotlin class/function/property.

compiler/testData/javaModules/simpleUseNonExportedPackage/moduleB/usage.kt

@@ -6,3 +6,14 @@ import a.impl.*
 val a1: A = A()
 val a2: A = A.getInstance()
 val a3: AImpl = A.getInstance()
+val a4: String = AImpl.method()
+val a5: String = AImpl.field
+
+val k1: K = K()
+val k2: K = K.getInstance()
+val k3: KImpl = K.getInstance()
+val k4: String = KImpl.method()
+val k5: String = KImpl.field
+
+val kf1: String = fileField
+val kf2: String = fileMethod()