patch 8.2.4559: getmousepos() returns the screen column

Problem:    getmousepos() returns the screen column. (Ernie Rael)
Solution:   Return the text column, as documented.
diff --git a/src/version.c b/src/version.c
index f211594..a8a8a64 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4559,
+/**/
     4558,
 /**/
     4557,