Only display “home” button with home privilege

i4/src/api.lua

@@ -338,6 +338,9 @@ i4.new_footer_button("home", {
 						 description = S"Go home",
 						 image = "i3_home.png",
 						 fields = home_footer_fields,
+						 access = function(player, data)
+							 return minetest.check_player_privs(player:get_player_name(), {home = true})
+						 end
 })
 
 i4.register_craft_type("digging", {

i4/src/gui.lua

@@ -615,8 +615,10 @@ local function settings_footer_fs(player, data, fs)
 			-- i4 stores home coordinates with one decimal of precision, as the blow fmt() statement
 			-- assumes. So we need to trim sethome’s coordinates to one decimal, likewise.
 			local home_pos = sethome.get(player:get_player_name())
+			if home_pos then
 				home = string.format("(%.1f,%.1f,%.1f)", home_pos.x, home_pos.y, home_pos.z)
 			end
+		end
 
 		if home then
 			str = home:gsub(",", "  "):sub(2,-2):gsub("%.%d", ""):gsub(