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.

src/vote.rs

@@ -115,6 +115,8 @@ pub async fn fetch_vote_data(week: u8, mut db: Connection<database::Db>) -> Opti
     }
 
 
+    // The hash map makes storing and retrieving the data really easy, *but*
+    // it does lose the order of the original array (which is sorted via the SQL).
     let mut vote_data = HashMap::<String, Vec<u8>>::new();
     let mut next_truth_number = 1;
     for raw_vote in raw_votes {