[APIv3] Fix cors allowable headers. Fixes #4178
[APIv3] Fix cors allowable headers. Fixes #4178

the-blue-alliance/the-blue-alliance,the-blue-alliance/the-blue-alliance,the-blue-alliance/the-blue-alliance,the-blue-alliance/the-blue-alliance,the-blue-alliance/the-blue-alliance,the-blue-alliance/the-blue-alliance