Use 'symbol' instead of 'classId' in FirResolvedQualifier

This commit solves problem with resolved qualifier of local class
#KT-36758 Fixed

compiler/testData/codegen/box/callableReference/function/local/classMember.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 fun box(): String {
     class Local {
         fun foo() = "OK"

compiler/testData/codegen/box/callableReference/function/local/localClassMember.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 fun box(): String {
     val result = "OK"