Add scroll_to_leader field to the [store_side] WML action

changelog

@@ -3,6 +3,8 @@ Version 1.11.6+dev:
    * Updated translations: Lithuanian
  * Lua API:
    * Added scroll_to_leader field to wesnoth.sides table elements.
+ * WML engine:
+   * [store_side] now stores the scroll_to_leader attribute from sides.
  * Miscellaneous and bug fixes:
    * Added -256 and -512 color shifts to FADE_TO_BLACK and FADE_TO_BLACK_HOLD
      macros to account for ToD color shifts greater than -31, guaranteeing complete

data/lua/wml-tags.lua

@@ -1012,6 +1012,7 @@ function wml_actions.store_side(cfg)
 				user_team_name = t.user_team_name,
 				color = t.color,
 				gold = t.gold,
+				scroll_to_leader = t.scroll_to_leader,
 				side = side_number
 			}
 		wesnoth.set_variable(string.format("%s[%u]", variable, index), container)