patch 8.1.1626: no test for closing a popup window with a modified buffer

Problem:    No test for closing a popup window with a modified buffer.
Solution:   Add a test.  Add "popups" to getbufinfo().
diff --git a/src/version.c b/src/version.c
index 157e9ec..e78733a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1626,
+/**/
     1625,
 /**/
     1624,