Set common width of 7em for special fields.

I used min-width because 'GeoJSON_clone' exceeds those 7em on some zoom levels.
The colon is attached to the input field (don't care).
I also removed a redundant .prop('disabled',false).
Defined explicit fill colors in script/fillColors.js.

Because as soon as I add a new type my beloved colors get screwed!!11!