UI: Changed the label of country field in volunteer signupform

[decon-harsh]

Description

Changed the label of country field in Volunteer Signup from City to Country

Fixes #1023

Type of Change:

• User Interface

Mocks

Before

After

Checklist:

• [X] My PR follows the style guidelines of this project
• [X] Fixed sign up form

Code/Quality Assurance Only

• [X] My changes generate no new warnings