Set default waterfall colors static viz (#20334)

Pursuant to issue #20332 - it was blanking out without settings set before

src/metabase/pulse/render/body.clj

@@ -795,12 +795,15 @@
         render-fn      (if (isa? (-> cols x-axis-rowfn :effective_type) :type/Temporal)
                          js-svg/timelineseries-waterfall
                          js-svg/categorical-waterfall)
+        show-total     (if (nil? (:waterfall.show_total viz-settings))
+                         true
+                         (:waterfall.show_total viz-settings))
         settings       (-> (->js-viz x-col y-col viz-settings)
                            (update-in [:colors] assoc
-                                      :waterfallTotal (:waterfall.total_color viz-settings)
-                                      :waterfallPositive (:waterfall.increase_color viz-settings)
-                                      :waterfallNegative (:waterfall.decrease_color viz-settings))
-                           (assoc :showTotal (:waterfall.show_total viz-settings)))
+                                      :waterfallTotal (or (:waterfall.total_color viz-settings) (nth colors 0))
+                                      :waterfallPositive (or (:waterfall.increase_color viz-settings) (nth colors 1))
+                                      :waterfallNegative (or (:waterfall.decrease_color viz-settings) (nth colors 2)))
+                           (assoc :showTotal show-total))
         image-bundle   (image-bundle/make-image-bundle
                         render-type
                         (render-fn rows