patch 8.2.2972: "%bd" tries to delete popup window buffers, which fails

Problem:    "%bd" tries to delete popup window buffers, which fails. (Ralf
            Schandl)
Solution:   Do not try to delete a popup window buffer. (closes #8349)

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2972,
 /**/
     2971,
 /**/