[Plot] Fix wiring on plot updater

Fix usages of the plot updater, introduced to track real-time
telemetry to remove the need to cache values elsewhere. This
allows memory usage to be decreased for WTD-751.

platform/features/plot/src/modes/PlotOverlayMode.js

@@ -38,7 +38,7 @@ define(
                     return {
                         buffer: buf,
                         color: PlotPalette.getFloatColor(i),
-                        points: buf.length / 2
+                        points: prepared.getLength(i)
                     };
                 });
 

platform/features/plot/src/modes/PlotStackMode.js

@@ -35,7 +35,7 @@ define(
                 subplot.getDrawingObject().lines = [{
                     buffer: buffer,
                     color: PlotPalette.getFloatColor(0),
-                    points: buffer.length / 2
+                    points: prepared.getLength(index)
                 }];
 
                 subplot.update();