fix(dashboard): open fullscreen on relaunch

Author: folke

lua/snacks/dashboard.lua

@@ -132,8 +132,8 @@ local defaults = {
 -- The other options are used with `:lua Snacks.dashboard()`
 Snacks.config.style("dashboard", {
   zindex = 10,
-  height = 0.6,
-  width = 0.6,
+  height = 0,
+  width = 0,
   bo = {
     bufhidden = "wipe",
     buftype = "nofile",