fix(auth): bind handleUnauthenticated to correct context

[Sofien-Sellami]

Context

The issue was that the handleUnauthenticated function passed as a prop to the PrivateRoute component was a regular function, which caused a scope issue with this. In this function, this referred to the global object instead of the instance of userAuthenticationService.

-public handleUnauthenticated() { return this.serviceImplementation._handleUnauthenticated(); }
The value of this was undefined instead of referring to the instance of userAuthenticationService.

Changes & Results

I modified the code to pass an arrow function instead of a regular function to the PrivateRoute component. This way, this is correctly bound to the context of userAuthenticationService.

Before:

-<PrivateRoute handleUnauthenticated={userAuthenticationService.handleUnauthenticated}>

After:

-<PrivateRoute handleUnauthenticated={() => userAuthenticationService.handleUnauthenticated()}>

Testing

Checklist

PR

• [] My Pull Request title is descriptive, accurate and follows the
  semantic-release format and guidelines.

Code

• [] My code has been well-documented (function documentation, inline comments,
  etc.)

Public Documentation Updates

• [] The documentation page has been updated as necessary for any public API
  additions or removals.

Tested Environment

• [] OS:
• [] Node version:
• [] Browser:

[netlify]

✅ Deploy Preview for ohif-platform-docs canceled.

Name	Link
🔨 Latest commit	92a97bd
🔍 Latest deploy log	https://app.netlify.com/sites/ohif-platform-docs/deploys/6642412b882ef900080299f7

[netlify]

✅ Deploy Preview for ohif-dev ready!

Name	Link
🔨 Latest commit	92a97bd
🔍 Latest deploy log	https://app.netlify.com/sites/ohif-dev/deploys/6642412b17aaab000701d5ed
😎 Deploy Preview	https://deploy-preview-4120--ohif-dev.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.