Correct submission behavior for postal form

[tdo95]

For the postal form submission we wanted to:

• recreate the on-click behaviour exhibited by the submit button
• prevent the default form submission behaviour, which refreshes the page

Solution

I used the .prevent event modifier to prevent the default submission behavior so that pressing enter no longer refreshes the page, but instead executes the CreateRepList function to display the representatives.

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Resolves #293

[paramsiddharth]

@tdo95 Good job, Tee! :) Thank you for the much needed fix!