fix:Update text input neutral variables
Updating the color variables used for the text inputs to match the latest design https://www.figma.com/file/qEddyqCrI7kPSBjGmwkZzQ/Pajamas-UI-Kit-Beta?node-id=425%3A10.
Updating the color variables used for the text inputs to match the latest design https://www.figma.com/file/qEddyqCrI7kPSBjGmwkZzQ/Pajamas-UI-Kit-Beta?node-id=425%3A10.