Fix error when using click 8.0.0

[jason-rayles-nbcuni]

This line gives the following error when using click 8.0.0 ValueError: 'default' must be a list when 'multiple' is true. see https://github.com/pallets/click/blob/e4301614347d20b90d7fad943a52e9f19bee6be9/src/click/core.py#L2107

[TimMcCauley]

For those having problems with this issue, I used a fork instead which fixed this in the latest master -

pip install git+https://github.com/jace/rq-dashboard.git@master

[ramvenuturumilli]

@eoranged Could you approve these changes and merge

[charliemday]

pip install git+https://github.com/jace/rq-dashboard.git@master

Thanks @TimMcCauley!

Though pip install git+https://github.com/jace/rq-dashboard.git@main (root branch seems to have changed to main)

[cjlapao]

@jason-rayles-nbcuni , this is already present in the base code