"Pixelated" SVGs

[spilth]

The following symbols have a pixelated look when scaled to large sizes and should be fixed to have a smoother look consistent with the rest of the symbols.

• guided-tours
• ice-skating
• mens-restroom
• pets-off-leash
• pets-on-leash
• post-office
• radiator-water
• restrooms
• rv-campground
• sanitary-disposal-station
• scuba-diving
• showers
• store

As an example, one of the more extreme cases of this "pixelation" is the ice-skating symbol:

A separate PR should be opened for each symbol with this issue for focused discussion and approval.