SLC: use fully expanded type when computing nullability

^KT-62757 fixed

compiler/testData/asJava/lightClasses/lightClassByFqName/nullabilityAnnotations/typeAlias.java

@@ -0,0 +1,3 @@
+public final class TypeAliasKt /* TypeAliasKt*/ {
+  public static final void foo(@org.jetbrains.annotations.Nullable() java.lang.String);//  foo(java.lang.String)
+}

compiler/testData/asJava/lightClasses/lightClassByFqName/nullabilityAnnotations/typeAlias.kt

@@ -0,0 +1,5 @@
+// TypeAliasKt
+
+typealias NullableString = String?
+
+fun foo(ns: NullableString) {}