Fix timeout on invalid set of exclusionary parameters in `/api/v1/timelines/public` (#26239)

app/models/public_feed.rb

@@ -45,11 +45,11 @@ class PublicFeed
   end
 
   def local_only?
-    options[:local]
+    options[:local] && !options[:remote]
   end
 
   def remote_only?
-    options[:remote]
+    options[:remote] && !options[:local]
   end
 
   def account?

spec/requests/api/v1/timelines/public_spec.rb

@@ -56,6 +56,13 @@ describe 'Public' do
         it_behaves_like 'a successful request to the public timeline'
       end
 
+      context 'with local and remote params' do
+        let(:params) { { local: true, remote: true } }
+        let(:expected_statuses) { [local_status, remote_status, media_status] }
+
+        it_behaves_like 'a successful request to the public timeline'
+      end
+
       context 'with only_media param' do
         let(:params) { { only_media: true } }
         let(:expected_statuses) { [media_status] }