chore(otp): Fix input field name

Author: max-pv

static/otp.html

@@ -29,7 +29,7 @@ <h1 class="ui header">Verify phone number</h1>
         <form class="ui form padded segment" method="post" action="/otp">
           <div class="field">
             <label>Username</label>
-            <input type="text" name="otp" required placeholder="Username you used on /register page" id="username" />
+            <input type="text" name="username" required placeholder="Username you used on /register page" id="username" />
           </div>
           <div class="field">
             <label>One time code</label>