Allow GIF and WEBP formats in image upload

Updated file input to accept additional image formats.

Author: triszt4n

app/views/albums/_modal.html.erb

@@ -15,7 +15,7 @@
           <div class="label">Válaszd ki a hozzáadandó képeket!</div>
           <div class="file is-fullwidth has-name">
             <label class="file-label">
-              <%= form.file_field :images, multiple: true, accept: 'image/png, image/jpeg', class: 'file-input', id: 'fileinput' %>
+              <%= form.file_field :images, multiple: true, accept: 'image/png,image/jpeg,image/gif,image/webp', class: 'file-input', id: 'fileinput' %>
               <span class="file-cta">
                 <span class="file-icon">
                   <i class="fas fa-upload"></i>