patch 8.1.0683: spell highlighting does not always end

Problem:    Spell highlighting does not always end. (Gary Johnson)
Solution:   Also reset char_attr when spell errors are highlighted.

src/version.c

@@ -799,6 +799,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    683,
 /**/
     682,
 /**/