Update SLogin.test.tsx

[SharavanMudaliar]

fix: Update request body handling from 'req.body' to 'await req.json()'

This commit addresses the issue where 'req.body' was used for request body handling, which caused a 'password' error. The code has been updated to correctly use 'await req.json()' to access the 'password' property.

These changes ensure that the request body is processed correctly in the SLogin test.

[redxzeta]

for some reason the test is failing