FIR: Fix resolution for type-alias based SAM

compiler/fir/analysis-tests/testData/resolveWithStdlib/samForComparator.kt

@@ -0,0 +1,10 @@
+// FULL_JDK
+
+fun foo(x: Comparator<in CharSequence>) {}
+
+
+fun main() {
+    foo { x, y ->
+        x.length - y.length
+    }
+}