Use icon from /images for window creation (#1738)

main.js

@@ -105,7 +105,7 @@ function createWindow () {
       //sandbox: true,
       preload: path.join(__dirname, 'preload.js')
     },
-    icon: __dirname + '/build/icons/png/512x512.png',
+    icon: path.join(__dirname, 'images', 'icon_256.png'),
   }, windowConfig);
 
   if (windowOptions.fullscreen === false) {

package.json

@@ -136,7 +136,6 @@
       "images/**",
       "fonts/*",
       "build/assets",
-      "build/icons/png/512x512.png",
       "node_modules/**",
       "!node_modules/spellchecker/vendor/hunspell/**/*",
       "!**/node_modules/*/{CHANGELOG.md,README.md,README,readme.md,readme,test,__tests__,tests,powered-test,example,examples,*.d.ts}",