FIR DFA: fix CFG with normal arg after lambda [KT-46825]

The fix is a bit hacky, but it's very simple. In addition, it still does
not handle the case where the receiver is a lambda function. But such
case seems to be fairly rare in practice.

compiler/testData/diagnostics/testsWithStdLib/smartcasts/lambdaInCallArgs.fir.kt

@@ -32,7 +32,7 @@ fun test_3() {
         foo(
             x.length, // stable smartcast
             { x = "" },
-            <!SMARTCAST_IMPOSSIBLE!>x<!>.length  // stable smartcast
+            x.length  // stable smartcast
         )
     }
 }