FIX: Do not mark badge image uploads as secure (#13193)

* FIX: Do not mark badge image uploads as secure

We do not need badge_image upload types to be marked as secure.
Post migration is the same as
https://github.com/discourse/discourse/pull/12081.

See
https://meta.discourse.org/t/secure-media-uploads/140017/122?u=martin

spec/lib/upload_security_spec.rb

@@ -25,6 +25,12 @@ RSpec.describe UploadSecurity do
       end
 
       context "when uploading in public context" do
+        describe "for a public type badge_image" do
+          let(:type) { 'badge_image' }
+          it "returns false" do
+            expect(subject.should_be_secure?).to eq(false)
+          end
+        end
         describe "for a public type group_flair" do
           let(:type) { 'group_flair' }
           it "returns false" do