graphics element hidden on creation option, changed hide/show logic to only hide/show current element

graphics/elements/animations/waiting.lua

@@ -10,6 +10,7 @@ local element = require("graphics.element")
 ---@field x? integer 1 if omitted
 ---@field y? integer 1 if omitted
 ---@field fg_bg? cpair foreground/background colors
+---@field hidden? boolean true to hide on initial draw
 
 -- new waiting animation element
 ---@param args waiting_args