cmd/example-app: fix custom CA behavior
cmd/example-app: fix custom CA behavior

circleci/dex,wolfeidau/dex,chub/coreos-dex,Calpicow/dex,ericchiang/dex,wolfeidau/dex,rithujohn191/dex,ericchiang/dex,coreos/dex,coreos/dex,chub/coreos-dex,circleci/dex,ericchiang/dex,coreos/dex,rithujohn191/dex,wolfeidau/dex,Calpicow/dex,Calpicow/dex,circleci/dex,chub/coreos-dex,rithujohn191/dex