Remove stat_smooth from ggplot example

Eliminated the use and import of stat_smooth in the static_plots example app, simplifying the plot output to only include points and facets.

Author: karangattu

examples/static_plots/app.py

@@ -78,7 +78,6 @@ def plotnine():
             facet_wrap,
             geom_point,
             ggplot,
-            stat_smooth,
             theme,
             theme_bw,
         )
@@ -89,7 +88,6 @@ def plotnine():
         return (
             ggplot(mtcars, aes(input.x(), input.y(), color=color_var))
             + geom_point()
-            + stat_smooth(method="lm")
             + facet_wrap("~gear")
             + theme_bw(base_size=16)
             + theme(legend_position="top")