[FIR] Run FirSupertypesChecker for anonymous objects, ^KT-54300 Fixed

compiler/fir/analysis-tests/testData/resolve/problems/objectDerivedFromInnerClass.fir.txt

@@ -4,7 +4,7 @@ FILE: objectDerivedFromInnerClass.kt
             super<R|kotlin/Any|>()
         }
 
-        public final inner class Inner : R|kotlin/Any| {
+        public open inner class Inner : R|kotlin/Any| {
             public Outer.constructor(): R|Outer.Inner| {
                 super<R|kotlin/Any|>()
             }

compiler/fir/analysis-tests/testData/resolve/problems/objectDerivedFromInnerClass.kt

@@ -1,4 +1,4 @@
-class Outer { inner class Inner }
+class Outer { open inner class Inner }
 fun test() {
     val x = object : <!UNRESOLVED_REFERENCE!>Outer.Inner<!>() { }
 }