patch 8.2.1581: using line() for global popup window doesn't work

Problem:    Using line() for global popup window doesn't work.
Solution:   Set tabpage to "curtab". (closes #6847)
diff --git a/src/version.c b/src/version.c
index 8d20b46..39e81bc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1581,
+/**/
     1580,
 /**/
     1579,