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/tests/smartCasts/variables/lambdaBetweenArguments.fir.kt

@@ -5,5 +5,5 @@ fun foo(x: Int, f: () -> Unit, y: Int) {}
 fun bar() {
     var x: Int?
     x = 4
-    foo(x, { x = null; x<!UNSAFE_CALL!>.<!>hashCode() }, <!SMARTCAST_IMPOSSIBLE!>x<!>)
+    foo(x, { x = null; x<!UNSAFE_CALL!>.<!>hashCode() }, x)
 }