[Talawa AdminUI-Redesign] Added absolute url for checkAuth query

[rishav-jha-mech]

What kind of change does this PR introduce?

Bugfix

Issue Number:

Fixes #1375

Did you add tests for your changes?

Not required

Snapshots/Videos:

N/A

If relevant, did you update the documentation?

N/A

Summary

CheckAuth from now on will provide absolute urls.

Does this PR introduce a breaking change?

No

Other information

N/A

Have you read the contributing guide?

Yes

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