patch 8.2.0281: two placed signs in the same line are not combined

Problem:    Two placed signs in the same line are not combined.  E.g. in the
            terminal debugger a breakpoint and the PC cannot be both be
            displayed.
Solution:   Combine the sign column and line highlight attributes.

src/version.c

@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    281,
 /**/
     280,
 /**/