patch 8.1.0665: text property display wrong when 'spell' is set

Problem:    Text property display wrong when 'spell' is set. (Dominique Pelle)
Solution:   Remove unnecessary assignment to char_attr.  Combine attributes if
            needed.  Add a screenshot test.

src/version.c

@@ -799,6 +799,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    665,
 /**/
     664,
 /**/