vote_chart: sort parsed votes

The SQL query retrieving the votes is deterministicly sorted, but goes through
a HashMap, for ease of processing and transfer, which does not maintaing order.

Sort the resulting object in the Javascript to keep a consistent order in the graph.

static_files/vote_chart.js

@@ -32,11 +32,15 @@ async function main() {
         return;
     }
 
+    // Sort by label to maintain the same graph order, as it goes through a hash map in the backend.
+    datasets.sort((a, b) => a.label > b.label)
+
     const chart_canvas = document.getElementById("vote_chart")
     let chart
     function create_chart(keys, data) {
         let main_axis;
         let aspect_ratio;
+        // TODO: Move to the event, to check and not re-create for no reason.
         if (window.innerWidth > window.innerHeight) {
             main_axis = 'x'
             aspect_ratio = 2