metric => decimal rename

source/DecimalWatchFaceApp.mc

@@ -1,7 +1,7 @@
 using Toybox.Application;
 using Toybox.WatchUi;
 
-class MetricWatchFaceApp extends Application.AppBase {
+class DecimalWatchFaceApp extends Application.AppBase {
 
     function initialize() {
         AppBase.initialize();
@@ -17,7 +17,7 @@ class MetricWatchFaceApp extends Application.AppBase {
 
     // Return the initial view of your application here
     function getInitialView() {
-        return [ new MetricWatchFaceView() ];
+        return [ new DecimalWatchFaceView() ];
     }
 
 }

source/DecimalWatchFaceView.mc

@@ -5,7 +5,7 @@ using Toybox.Lang;
 using Toybox.Time;
 using Toybox.Time.Gregorian;
 
-class MetricWatchFaceView extends WatchUi.WatchFace {
+class DecimalWatchFaceView extends WatchUi.WatchFace {
 
     function initialize() {
         WatchFace.initialize();