Store avatars as binary instead of base64

app/views/settings/_profile.html.erb

@@ -20,7 +20,7 @@
       </button>
     </p>
     <p class="text-sm text-gray-500">
-      Your user address for Chat and Lightning Network.
+      Your account's address on the Internet
     </p>
   </div>
   <%= form_for(@user, url: setting_path(:profile), html: { :method => :put }) do |f| %>
@@ -40,9 +40,10 @@
         Default profile picture
       </p>
       <div class="flex items-center gap-6">
-        <% if current_user.avatar.present? %>
+        <% unless current_user.avatar.nil? %>
         <p class="flex-none">
-          <%= image_tag "data:image/jpeg;base64,#{current_user.avatar}", class: "h-24 w-24 rounded-lg" %>
+          <%= image_tag "data:image/jpeg;base64,#{current_user.avatar_base64}",
+                class: "h-24 w-24 rounded-lg" %>
         </p>
         <% end %>
         <div class="grow">