[FIR] Properly set isReceiver for implicit invoke on function types

compiler/testData/diagnostics/tests/regressions/kt5362.fir.kt

@@ -1,30 +0,0 @@
-// KT-5362 Compiler crashes on access to extension method from nested class
-class Outer {
-    class Nested{
-        fun foo(s: String) = s.<!UNRESOLVED_REFERENCE!>extension<!>()
-    }
-
-    private fun String.extension(): String = this
-}
-
-// EA-64302 - UOE: CodegenContext.getOuterExpression
-fun Activity.toast() = Unit
-class Activity(){
-    class Fragment{
-        fun call() = <!UNRESOLVED_REFERENCE_WRONG_RECEIVER!>toast<!>()
-    }
-}
-
-// KT-8814 No error in IDE for invalid invoke of OuterClass.()->Unit in static nested class
-public class Manager {
-    fun task(callback: Manager.() -> Unit): Task {
-        val task = Task(callback)
-        return task
-    }
-
-    class Task(val callback: Manager.() -> Unit) : Runnable {
-        override public fun run() {
-            <!ARGUMENT_TYPE_MISMATCH!>callback<!>() // Manager is not accessible here, but no error is shown
-        }
-    }
-}

compiler/testData/diagnostics/tests/regressions/kt5362.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // KT-5362 Compiler crashes on access to extension method from nested class
 class Outer {
     class Nested{