Fix selector priority in apply method

The array sort function was used incorrectly, but happened to behave as
expected in the scenario given by the unit tests.

Change-Id: I789875044b294002f248ceb8ecfa116de8f444a0

src/tabris/Widget.js

@@ -134,7 +134,7 @@ export default class Widget extends NativeObject {
     }
     Object.keys(sheet)
       .map(key => [createSelectorArray(key, this), sheet[key]])
-      .sort(rule => getSelectorSpecificity(rule[0]))
+      .sort((rule1, rule2) => getSelectorSpecificity(rule1[0]) - getSelectorSpecificity(rule2[0]))
       .forEach(rule => {
         scope.filter(rule[0]).set(rule[1]);
       });

test/tabris/Widget.test.js

@@ -1055,10 +1055,10 @@ describe('Widget', function() {
 
       it('applies properties in order *, Type, (pseudo-)class, id', function() {
         widget.apply({
+          'TestWidget': {prop1: 'v2'},
           '#foo': {prop1: 'v4'},
           '.myclass': {prop1: 'v3'},
           ':host': {prop1: 'v3'},
-          'TestWidget': {prop1: 'v2'},
           '*': {prop1: 'v1'}
         });