patch 8.1.1874: modeless selection in popup window overlaps scrollbar

Problem:    Modeless selection in popup window overlaps scrollbar.
Solution:   Subtract scrollbar from max_col. (closes #4773)
diff --git a/src/version.c b/src/version.c
index 081e84a..8753421 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1874,
+/**/
     1873,
 /**/
     1872,