Remove Final from AfterLoadFlags

It is set when completing a class if it's a value class.

Author: smarter

compiler/src/dotty/tools/dotc/core/Flags.scala

@@ -468,7 +468,7 @@ object Flags {
    *  is completed)
    */
   final val AfterLoadFlags =
-    FromStartFlags | AccessFlags | Final | AccessorOrSealed | LazyOrTrait | SelfNameOrImplClass
+    FromStartFlags | AccessFlags | AccessorOrSealed | LazyOrTrait | SelfNameOrImplClass
 
   assert(FromStartFlags.isTermFlags && FromStartFlags.isTypeFlags)
   // TODO: Should check that FromStartFlags do not change in completion