LibJS: Cleanup unwind state when transferring control out of a finalizer

This does two things:
* Clear exceptions when transferring control out of a finalizer
  Otherwise they would resurface at the end of the next finalizer
  (see test the new test case), or at the end of a function
* Pop one scheduled jump when transferring control out of a finalizer
  This removes one old FIXME

Userland/Libraries/LibJS/Bytecode/Generator.cpp

@@ -532,7 +532,10 @@ void Generator::generate_scoped_jump(JumpType type)
             switch_to_basic_block(block);
             last_was_finally = true;
             break;
-        };
+        }
+        case LeaveFinally:
+            emit<Op::LeaveFinally>();
+            break;
         }
     }
     VERIFY_NOT_REACHED();