fix layout help text. use api probe definition

src/kiri/export.js

@@ -239,7 +239,7 @@
             if (dev) {
                 let file = $('print-filename').value;
                 fetch(
-                    `https://live.grid.space/api/grid_send?uuid=${uuid}&file=${encodeURIComponent(file + "." + fileext)}`,
+                    `${API.probe.live}/api/grid_send?uuid=${uuid}&file=${encodeURIComponent(file + "." + fileext)}`,
                     {method: "POST", body: gcode}
                 )
                 .then(t => t.text())

src/kiri/main.js

@@ -251,6 +251,7 @@
             clear: clearPrint
         },
         probe: {
+            live : "https://live.grid.space",
             grid : function() { return false },
             local : function() { return false }
         },