Decrement mode keybindings (fixes #1073)

js/id/modes/add_area.js

@@ -4,7 +4,7 @@ iD.modes.AddArea = function(context) {
         button: 'area',
         title: t('modes.add_area.title'),
         description: t('modes.add_area.description'),
-        key: '4'
+        key: '3'
     };
 
     var behavior = iD.behavior.AddWay(context)

js/id/modes/add_line.js

@@ -4,7 +4,7 @@ iD.modes.AddLine = function(context) {
         button: 'line',
         title: t('modes.add_line.title'),
         description: t('modes.add_line.description'),
-        key: '3'
+        key: '2'
     };
 
     var behavior = iD.behavior.AddWay(context)

js/id/modes/add_point.js

@@ -3,7 +3,7 @@ iD.modes.AddPoint = function(context) {
         id: 'add-point',
         title: t('modes.add_point.title'),
         description: t('modes.add_point.description'),
-        key: '2'
+        key: '1'
     };
 
     var behavior = iD.behavior.Draw(context)