[K/N] Fix work with adapted function references

Their parsing was totally incorrect for K2, and sometimes incorrect for
K1. After this commit it uses same code as for JVM.

^KT-55462

compiler/testData/codegen/box/funInterface/equality/functionReferencesUnbound.kt

@@ -1,8 +1,6 @@
 // IGNORE_BACKEND: WASM
 // WASM_MUTE_REASON: IGNORED_IN_JS
 // IGNORE_BACKEND: JS, JS_IR, JS_IR_ES6
-// KT-55463
-// IGNORE_BACKEND_K2: NATIVE
 // FILE: test.kt
 
 fun checkEqual(x: Any, y: Any) {