Display control type filter as dropdown

[missionfloyd]

The control types are starting to take up a lot of space.

This adds an option to put them in a dropdown instead.

[huchenlei]

See reason why it is not a dropdown: #1422 (comment)

[missionfloyd]

That's why I made it optional.

[huchenlei]

LGTM

[huchenlei]

Do note that some JS hacks will be broken if you change it to dropdown:

sd-webui-controlnet/javascript/active_units.js

Line 74 in f0a94cb

this.controlTypeRadios = tab.querySelectorAll('.controlnet_control_type_filter_group input[type="radio"]');