Fix passing company ID to expenses chart query

By mistake, i was using 1 instead of $1, but i all was OK in testing
because there is only a single company with ID = 1.

pkg/dashboard.go

@@ -203,7 +203,7 @@ func buildDashboardChart(ctx context.Context, conn *Conn, locale *Locale, compan
         	select to_char(date.invoice_date, '%[3]s')::integer as date
         	     , sum(amount)::integer as total
             from generate_series(%[1]s, %[2]s, interval '1 day') as date(invoice_date)
-            left join expense on expense.invoice_date = date.invoice_date and company_id = 1
+            left join expense on expense.invoice_date = date.invoice_date and company_id = $1
             group by date
         ) as expense using (date)
       order by date