Minor, rename and adapt test

compiler/testData/codegen/boxWithStdlib/callableReference/function/enumNameMethod.kt

@@ -1,9 +0,0 @@
-enum class E {
-    I
-}
-
-fun box(): String {
-    val i = (E::name.getter)(E.I)
-    if (i != "I") return "Fail $i"
-    return "OK"
-}

compiler/testData/codegen/boxWithStdlib/callableReference/property/enumNameOrdinal.kt

@@ -0,0 +1,11 @@
+enum class E {
+    I
+}
+
+fun box(): String {
+    val i = (E::name).get(E.I)
+    if (i != "I") return "Fail $i"
+    val n = (E::ordinal).get(E.I)
+    if (n != 0) return "Fail $n"
+    return "OK"
+}