patch 8.1.2250: CTRL-U and CTRL-D don't work in popup window

Problem:    CTRL-U and CTRL-D don't work in popup window.
Solution:   Initialize 'scroll'.  Add "lastline" in popup_getpos().
            (closes #5170)
diff --git a/src/version.c b/src/version.c
index 0418204..5a4a1e4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2250,
+/**/
     2249,
 /**/
     2248,