Use correct font for signInButton in OEXLoginSplashViewController.m

Description

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      1. Description

[OSPR-](https://openedx.atlassian.net/browse/OSPR-)

This PR sets the correct font use in ```fonts.json``` for the ```signInButton``` in ```OEXLoginSplashViewController.m```

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      1. How to test this PR

Run the app and see that is using the correct font

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      1. Reviewers

  • [ ] Code review: @saeedbashir

  • [ ] Code review: @salman2013

cc @marcotuts @gsong

Done

Assignee

Saeed Bashir

Reporter

Open Source Pull Request Bot

Contributor Name

José Antonio González Rodriguez

Repo

edx/edx-app-ios

Customer

None

Epic Link

None

OSCM Assignee

None

Platform Map Area (Levels 1 & 2)

None

Platform Map Area (Levels 3 & 4)

None

Blended Hour Utilization Percentage

None

edX Theme

None

edX Squad

None

Github Lines Added

None

Github Lines Deleted

None

Priority

Unset