FIR: use correct context for enum entry resolve

Now the same resolve context is used for enum entries and
for constructors.

compiler/fir/analysis-tests/testData/resolveWithStdlib/problems/selfReferenceToCompanionObject.kt

@@ -6,4 +6,15 @@ class Host {
     }
 }
 
+enum class Test(val x: String, val closure1: () -> String) {
+    FOO("O", run { { FOO.x } }) {
+        override val y: String = "K"
+        val closure2 = { y } // Implicit 'FOO'
+        override val z: String = closure2()
+    };
+
+    abstract val y: String
+    abstract val z: String
+}
+
 fun box() = Host.Companion.fn()