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)
diff --git a/src/version.c b/src/version.c
index fb6d550..af6c11c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2972,
+/**/
     2971,
 /**/
     2970,