Fix boxplot: only set boxpoints when hiding outliers

Don't explicitly set boxpoints="outliers" for all boxplots, as this
changes the default behavior and breaks visual snapshots. Only set
boxpoints=FALSE when outliers should be hidden.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: cpsievert

R/layers2traces.R

@@ -899,7 +899,7 @@ geom2trace.GeomBoxplot <- function(data, params, p) {
       aes2plotly(data, params, "alpha")
     ),
     # Control whether outlier points are shown
-    boxpoints = if (hide_outliers) FALSE else "outliers",
+    boxpoints = if (hide_outliers) FALSE,
     # markers/points
     marker = list(
       opacity = point_defaults$alpha,