fix: inifite loading on two factor login

[OtavioStasiak]

Proposed changes

In our production version, when you try to log in to a two-factor account and click 'Cancel,' the Login button remains loading and disabled because the isFetching state is not updated. This PR fixes that issue.

Issue(s)

https://rocketchat.atlassian.net/browse/NATIVE-737

How to test or reproduce

• Open the app;
• Try to log in on account with two factor enabled.
• click on cancel;

Screenshots

| Before | After |

| | |

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves a current function)
• New feature (non-breaking change which adds functionality)
• Documentation update (if none of the other choices apply)

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• I have added necessary documentation (if applicable)
• Any dependent changes have been merged and published in downstream modules

Further comments