[FIR] Remove a hack about local classes

^KT-54390 Fixed

compiler/fir/analysis-tests/testData/resolve/properLocalPackages.kt

@@ -0,0 +1,19 @@
+package a.b
+
+class X {
+    fun foo() {
+        class U {
+            inner class K {
+                inner class D {
+                    fun check() {
+                        class F {
+                            inner class L
+                        }
+                    }
+                }
+            }
+
+            <!NESTED_CLASS_NOT_ALLOWED!>class T<!>
+        }
+    }
+}