Move to using dfeshiny cookies

[cjrace]

Is your feature request related to a problem? Please describe.
We have cookies functions in dfeshiny now, we should add them here to simplify the code and allow for easier updating moving forwards

Describe the solution you'd like

• All cookie code is handled using the dfeshiny functions
• dfeshiny::init_cookies() is run to update the cookies js

Describe alternatives you've considered
None

Additional context
None