MOBILE-2619 desktop: Fix entitlements and libraries

desktop/assets/mac/parent.plist

@@ -14,5 +14,7 @@
     <true/>
     <key>com.apple.security.files.user-selected.read-only</key>
     <true/>
+    <key>com.apple.security.device.audio-input</key>
+    <true/>
   </dict>
 </plist>

package.json

@@ -99,6 +99,7 @@
   "devDependencies": {
     "@ionic/app-scripts": "3.1.9",
     "electron-rebuild": "^1.8.1",
+    "electron-builder-lib": "^20.23.1",
     "gulp": "^4.0.0",
     "gulp-clip-empty-files": "^0.1.2",
     "gulp-flatten": "^0.4.0",
@@ -110,10 +111,6 @@
     "typescript": "~2.6.2",
     "webpack-merge": "^4.1.2"
   },
-  "optionalDependencies": {
-    "electron-windows-notifications": "^2.1.1",
-    "electron-builder-squirrel-windows": "^20.19.0"
-  },
   "browser": {
     "electron": false
   },
@@ -174,7 +171,8 @@
       "icon": "resources/desktop/icon.ico"
     },
     "linux": {
-      "category": "Education"
+      "category": "Education",
+      "target": "AppImage"
     },
     "snap": {
       "confinement": "classic"