patch 9.0.2119: remove dead-condition in ex_class

Problem:  remove dead-condition in ex_class()
Solution: remove the extra condition

The variable is_class must be true once we reach the

,----
| else if (has_static)
`----

in line 1750, because we break out earlier if is_class is false in line
1598 of vim9class.c. And once 'has_static = TRUE', we must be in a
class and there fore is_class is true.

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/vim9class.c b/src/vim9class.c
index 6149226..c0705ff 100644
--- a/src/vim9class.c
+++ b/src/vim9class.c
@@ -1761,7 +1761,7 @@
 
 	    if (parse_member(eap, line, varname, has_public,
 		      &varname_end, &has_type, &type_list, &type,
-		      is_class ? &init_expr : NULL) == FAIL)
+		      &init_expr) == FAIL)
 		break;
 	    if (is_reserved_varname(varname, varname_end))
 	    {