Do not allow [message] to scroll to units through fog/shroud

This was a regression from 1.12.

(cherry-picked from commit 8ae38ac19f)

changelog.md

@@ -191,6 +191,8 @@
    * Added stricter validation to ensure units cannot have negative hitpoints,
      except during specific attack-related events.
    * Added deprecation notices for several macros that had them missing before.
+   * [message] no longer scrolls to units through fog or shroud so it matches
+     1.12's behavior.
 
 ## Version 1.13.12
  ### Security fixes

data/lua/wml/message.lua

@@ -416,7 +416,7 @@ function wesnoth.wml_actions.message(cfg)
 	else
 		-- Check ~= false, because the default if omitted should be true
 		if cfg.scroll ~= false then
-			wesnoth.scroll_to_tile(speaker.x, speaker.y, false, false, true)
+			wesnoth.scroll_to_tile(speaker.x, speaker.y, true, false, true)
 		end
 
 		wesnoth.highlight_hex(speaker.x, speaker.y)