[expo-notifications] Fix test-suite - ERROR: 'DEPRECATION: fit' (#9191)
[expo-notifications] Fix test-suite - ERROR: 'DEPRECATION: fit' (#9191)

# Why

Fixes:
`ERROR: 'DEPRECATION: fit and fdescribe will cause your suite to report an 'incomplete' status in Jasmine 3.0'`

# How

Uses `is` instead of `fit`. 

# Test Plan

- test-suite ✅

exponentjs/exponent,exponent/exponent,exponent/exponent,exponentjs/exponent,exponent/exponent,exponentjs/exponent,exponent/exponent,exponent/exponent,exponentjs/exponent,exponent/exponent,exponentjs/exponent,exponentjs/exponent,exponentjs/exponent,exponent/exponent,exponentjs/exponent,exponent/exponent,exponent/exponent,exponentjs/exponent