Attendee Form: Make gender field a dropdown instead of textbox

[kushthedude]

Describe the bug

Gender Field is currently a textbox in Attendee Form.

To Reproduce

Steps to reproduce the behaviour:

1. Go to 'Gender Field'
2. See error

Expected behaviour

Please make it a dropdown as done in Speaker Form
Screenshots

Desktop (please complete the following information):

• OS: MacOS
• Browser Chrome
• Version 24

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context

[prateekj117]

@kushthedude On it.

[kushthedude]

@prateekj almost done the following , Can you please take some else?

…

On Mon, 24 Jun 2019 at 1:09 PM, Prateek Jain ***@***.***> wrote: @kushthedude <https://github.com/kushthedude> On it. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#3176?email_source=notifications&email_token=AKQMTLUQAUUABONCPMETX6LP4B22VA5CNFSM4H2X46IKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODYMBUYA#issuecomment-504896096>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AKQMTLSGRWIN62NV7TH7XSTP4B22VANCNFSM4H2X46IA> .