fix: add missing signcolumn_enabled condition

Author: mehalter

lua/astroui/status/condition.lua

@@ -140,4 +140,8 @@ function M.foldcolumn_enabled() return vim.opt.foldcolumn:get() ~= "0" end
 ---@return boolean # true if vim.opt.number or vim.opt.relativenumber, false if neither
 function M.numbercolumn_enabled() return vim.opt.number:get() or vim.opt.relativenumber:get() end
 
+--- A condition function if the signcolumn is enabled
+---@return boolean # false if vim.opt.signcolumn == "no", true otherwise
+function M.signcolumn_enabled() return vim.opt.signcolumn:get() ~= "no" end
+
 return M