[FIR] Fix lambda resolve in independent context

compiler/testData/diagnostics/tests/exposed/internalFromLocal.fir.kt

@@ -3,8 +3,8 @@ interface Your
 class My {
     internal val x = object : Your {}
 
-    internal fun foo() = <!UNRESOLVED_REFERENCE!>{
+    internal fun foo() = {
         class Local
         Local()
-    }()<!>
+    }()
 }

compiler/testData/diagnostics/tests/exposed/privateFromLocal.fir.kt

@@ -5,8 +5,8 @@ class My {
     private val x = object : Your {}
 
     // private from local: ???
-    private fun foo() = <!UNRESOLVED_REFERENCE!>{
+    private fun foo() = {
         class Local
         Local()
-    }()<!>
+    }()
 }