templates/dashboard: Bounty explorer to show bounties value in usdt a…

…t the time of the web3_created.

To stop fluctuating prices on bounties explorer, use ConversionRate at the web3_created bounty timestamp.

Issue: gitcoinco#693

app/dashboard/templates/dashboard.html

@@ -107,10 +107,10 @@ <h3>{% trans "No results found." %}</h3>
               <span>[[:token_name]]</span>
             </p>
           </div>
-          [[if value_in_usdt_now]]
+          [[if value_in_usdt]]
             <div class="tag usd">
               <p>
-                [[:value_in_usdt_now]]
+                [[:value_in_usdt]]
                 <span>USD</span>
               </p>
             </div>