Fix application of the scale argument for geoviews features

[FabianHofmann]

When creating a figure with geo=True, the scale argument for geoviews-features is currently ignored. According to the documentation and docstrings, this should be supported via setting the feature argument to a dictionary in the form of {feature: scale}.

With this change, the scale argument is forwarded to the opts function of the geoviews feature class.

Test with

import hvplot.pandas  # noqa
from bokeh.sampledata.airport_routes import airports

plot = airports.hvplot.points(
    "Longitude",
    "Latitude",
    geo=True,
    color="red",
    alpha=0.2,
    xlim=(-180, -30),
    ylim=(0, 72),
    tiles="ESRI",
    features={"states": "10m"},
)

hvplot.show(plot)

[philippjfr]

Good catch, thank you!

[FabianHofmann]

@philippjfr my pleasure!