patch 8.1.0187: getwininfo() and win_screenpos() return different numbers

Problem:    getwininfo() and win_screenpos() return different numbers.
Solution:   Add one to "wincol" and "winrow" from getwininfo().
diff --git a/src/version.c b/src/version.c
index 08e39b4..559d8be 100644
--- a/src/version.c
+++ b/src/version.c
@@ -790,6 +790,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    187,
+/**/
     186,
 /**/
     185,