restrict height of the custom brand logo in emails

app/helpers/emails_helper.rb

@@ -54,7 +54,10 @@ module EmailsHelper
   def header_logo
     if brand_item && brand_item.header_logo?
-      brand_header_logo
+      image_tag(
+        brand_item.header_logo,
+        style: 'height: 50px'
+      )
     else
       image_tag(
         image_url('mailers/gitlab_header_logo.gif'),

spec/helpers/emails_helper_spec.rb

@@ -52,7 +52,7 @@ describe EmailsHelper do
         )
         expect(header_logo).to eq(
-          %{<img src="/uploads/appearance/header_logo/#{appearance.id}/dk.png" alt="Dk" />}
+          %{<img style="height: 50px" src="/uploads/appearance/header_logo/#{appearance.id}/dk.png" alt="Dk" />}
         )
       end
     end