Enatega Rider App: Wrong placeholder in the username field of rider login.

Describe the bug
When trying to log in to the rider app, the placeholder in the username field is "Email". It should be "username"

To Reproduce
Steps to reproduce the behavior:

Open the rider app log in page.
observe the placeholder of the username field
it states "email".
Expected behavior
username field should have placeholder "username".

Smartphone (please complete the following information):

Device: [iOS]
OS: [iOS]
Browser [app]

Labels: Enatega Multivendor Rider App, Bug

Start in the Enatega Multivendor Rider App's login screen and locate the username field by searching for its current "Email" placeholder. Run the rider app on iOS, confirm the login field displays "username", and verify the rest of the login screen still works.

Written by the indexing model from the issue text.