patch 8.0.1233: typo in dos installer

Problem:    Typo in dos installer.
Solution:   Remove comma.

src/dosinst.c

@@ -86,7 +86,7 @@ char	*remap_text = "- %s";
 enum
 {
     mouse_xterm = 1,
-    mouse_mswin,,
+    mouse_mswin,
     mouse_default
 };
 char	*(mouse_choices[]) =

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1233,
 /**/
     1232,
 /**/