[Android] Emails over 26 characters are not fully visible in the password screen

[Softvision-MariusComan]

[Affected Platforms]:

• Android 8.0.0 (Google Pixel)
• Android 8.0.0 (Samsung S8)
• Android 6.0 (Huawei P8 Lite)

[Prerequisites]:

• Have the latest version of the "Firefox Notes" application (app-release-signed) custom built on 7/27/2018 installed.
• You are not logged into "Firefox Notes".
• Have a Firefox Account with an e-mail address over 26 characters (e.g. [email protected]).

[Steps to reproduce]:

1. Open the Notes application and tap the "Sign In" button.
2. Enter the email from prerequisites and tap the "Continue" button.
3. Observe the email field.

[Expected result]:

• The email is correctly displayed and fully visible.

[Actual result]:

• The email's final part is not visible.

[Notes]:

• Attached a screen recording of the issue:

[vladikoff]

Filed https://github.com/mozilla/fxa-content-server/issues/6396