Fix flow for username with less than 4 characters

[tkz00]

Closes #1815

Motivation

There is an error where if you input a username with less than 4 characters, the popup will become transparent, but still be there, blocking the flow of the application, instead of showing the respective error. [BUG] User flow broken if name less than 4 characters

Summary of changes

• Fixed the issue that made the set name popup transparent instead of displaying an error when a name with less than 4 characters was input.
• Added new logic to the close button of the popup, and a new error message that helps the user better understand the flow.

How has this been tested?

Clear your player prefs (cache on iOS or android), and set a name, try to edit it, try to put less than 4 characters, save while leaving the input empty, test that flow feels right. Remember it shouldn't let you set usernames with less than 4 characters.

References:

Checklist

• [X] I have tested the changes locally.
• [X] I have tested the whole game after applying the changes, not only the affected areas.
• [X] I self-reviewed the changes on GitHub, line by line.
• [X] I have tested the changes in another devices.
  • [ ] Tested in iOS.
  • [X] Tested in Android.
• [ ] This change requires new documentation.
  • [ ] Documentation has been added/updated.

[tkz00]

I see no point in showing an x button if I'll never be able to use it in that instance. Could we not show it in this case and ave it enabled if the user already has a name set?

Agree! The change has been made.

[AngieDutra]

IMO this is more of a path tho and the real issue remains. Why would everything crash if I have 3 letters in my name? That is the ting to fix also