patch 8.0.0390: when the window scrolls the popup menu may be garbled

Problem:    When the window scrolls horizontally when the popup menu is
            displayed part of it may not be cleared. (Neovim issue #6184)
Solution:   Remove the menu when the windows scrolled. (closes #1524)

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    390,
 /**/
     389,
 /**/