Upgrade small logo icons

package.json

@@ -15,8 +15,7 @@
     "postinstall": "patch-package && electron-builder install-app-deps && rimraf node_modules/dtrace-provider",
     "start": "electron .",
     "grunt": "grunt",
-    "icon-gen": "electron-icon-maker --input=images/icon_1024.png --output=./build",
-    "generate": "yarn icon-gen && yarn grunt",
+    "generate": "yarn grunt",
     "build-release": "npm run build",
     "sign-release": "node ts/updater/generateSignature.js",
     "notarize": "node ts/build/notarize.js",
@@ -205,7 +204,6 @@
     "dashdash": "1.14.1",
     "electron": "8.2.1",
     "electron-builder": "22.3.6",
-    "electron-icon-maker": "0.0.3",
     "eslint": "4.14.0",
     "eslint-config-airbnb-base": "12.1.0",
     "eslint-config-prettier": "2.9.0",