Replace sqare + with circle +

src/app/tabs/run-tab.js

@@ -409,7 +409,7 @@ function settings (container, appAPI, appEvents) {
         <div class="${css.col1_1}">Account</div>
         <select name="txorigin" class="${css.select}" id="txorigin"></select>
           ${copyToClipboard(() => document.querySelector('#runTabView #txorigin').value)}
-          <i class="fa fa-plus-square-o ${css.icon}" aria-hidden="true" onclick=${newAccount} title="Create a new account"></i>
+          <i class="fa fa-plus-circle ${css.icon}" aria-hidden="true" onclick=${newAccount} title="Create a new account"></i>
       </div>
       <div class="${css.crow}">
         <div class="${css.col1_1}">Gas limit</div>
@@ -431,7 +431,6 @@ function settings (container, appAPI, appEvents) {
       </div>
     </div>
   `
-
   // EVENTS
   appEvents.udapp.register('transactionExecuted', (error, from, to, data, lookupOnly, txResult) => {
     if (error) return