[FIR] Fix building callable reference adaptation against flexible types

#KT-45052 Fixed

compiler/fir/analysis-tests/testData/resolveWithStdlib/callableReferences/referenceToJavaStdlib.kt

@@ -0,0 +1,18 @@
+// ISSUE: KT-45052
+// FULL_JDK
+// JVM_TARGET: 1.8
+
+import java.io.File
+import java.nio.file.Files
+
+fun detectDirsWithTestsMapFileOnly(file: File): List<String> {
+    Files.walk(file.toPath()).filter(Files::isRegularFile)
+}
+
+interface A
+fun foo(x: A, vararg strings: String) {}
+fun takeFunWithA(func: (A) -> Unit) {}
+
+fun test() {
+    takeFunWithA(::foo)
+}