Enums are now augmentable

I see no reason why an enum should not be augmentable. Indeed there are tests
for augmenting Bool which is an enum by spec. So remove the bogus test.

S32-exceptions/misc.t

@@ -3,7 +3,7 @@ use Test;
 use lib "t/spec/packages";
 use Test::Util;
 
-plan 347;
+plan 346;
 
 throws-like '42 +', X::AdHoc, "missing rhs of infix", message => rx/term/;
 
@@ -127,7 +127,6 @@ throws-like 'augment class Any { }', X::Syntax::Augment::WithoutMonkeyTyping;
 throws-like '{ use MONKEY-TYPING; }; augment class Any { }', X::Syntax::Augment::WithoutMonkeyTyping,
     'MONKEY-TYPING applies lexically';
 throws-like 'use MONKEY-TYPING; augment role Positional { }', X::Syntax::Augment::Illegal;
-throws-like 'use MONKEY-TYPING; enum Weekday <Mon Tue>; augment class Weekday { }', X::Syntax::Augment::Illegal;
 throws-like 'sub postbla:sym<foo>() { }', X::Syntax::Extension::Category, category => 'postbla';
 # RT #73938
 throws-like 'sub twigil:<@>() { }', X::Syntax::Extension::Category, category => 'twigil';