fix(electron): Add missing tslib dependency

By manually packaging the application I've had the following issue when running the application:

```
Error: Cannot find module 'tslib'
```

The runtime depends on it because we enable `importHelpers` in `tsconfig.json`.
The fix for that error is simple: Make the package depends directly on `tslib` for it to be included in `app.asar`.

Author: FirelightFlagboy

client/electron/package-lock.json

@@ -33,7 +33,8 @@
         "electron-unhandled": "~4.0.1",
         "electron-updater": "6.3.9",
         "electron-window-state": "~5.0.3",
-        "regedit": "^5.1.4"
+        "regedit": "^5.1.4",
+        "tslib": "^2.8.1"
     },
     "devDependencies": {
         "@electron/notarize": "^2.5.0",