locale: fix trailing space on date < 10

The trailing whitespace would make the date string look uncentered on
e.g. `antonclk` clock app on Bangle.js.

Possibly similar change should be made to the `locale` library of
espruino/BangleApps - but I'm not sure.

libs/js/banglejs/locale.js

@@ -5,7 +5,7 @@ function round(n, dp) {
 }
 exports = { name : "system", currencySym:"£",
   translate : str=>str, // as-is
-  date : (d,short) => short?("0"+d.getDate()).substr(-2)+"/"+("0"+(d.getMonth()+1)).substr(-2)+"/"+d.getFullYear():d.toString().substr(4,11), // Date to "Feb 28 2020" or "28/02/2020"(short)
+  date : (d,short) => short?("0"+d.getDate()).substr(-2)+"/"+("0"+(d.getMonth()+1)).substr(-2)+"/"+d.getFullYear():d.toString().substr(4,11).trim(), // Date to "Feb 28 2020" or "28/02/2020"(short)
   time : (d,short) => { // Date to  "4:15.28 pm" or "15:42"(short)
 	  var h = d.getHours(), m = d.getMinutes()
     if ((require('Storage').readJSON('setting.json',1)||{})["12hour"])