[LL API] Get designation correctly for enum value members (KTIJ-23458)

Although being a 'KtClass' in the PSI, 'KtEnumEntry' is a callable in
Analysis API, and its direct members should also be treated as local.

analysis/low-level-api-fir/testdata/onAirResolve/enumValueMember.kt

@@ -0,0 +1,7 @@
+enum class Foo {
+    VALUE {
+        /*PLACE*/fun run() = 1
+    }
+}
+
+/*ONAIR*/fun box(): Int = 0

analysis/low-level-api-fir/testdata/onAirResolve/enumValueMember.txt

@@ -0,0 +1,3 @@
+public final [BODY_RESOLVE] fun box(): R|kotlin/Int| {
+    ^box Int(0)
+}