patch 8.1.1592: may start file dialog while exiting

Problem:    May start file dialog while exiting.
Solution:   Ignore the "browse" modifier when exiting. (Ozaki Kiichi,
            closes #4582
diff --git a/src/version.c b/src/version.c
index c21c12c..5514b4b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1592,
+/**/
     1591,
 /**/
     1590,