Only update scheme if present in shell app builder
Only update scheme if present in shell app builder

fbshipit-source-id: 483679b

jolicloud/exponent,exponent/exponent,exponentjs/exponent,exponent/exponent,exponentjs/exponent,exponentjs/exponent,jolicloud/exponent,exponent/exponent,exponent/exponent,jolicloud/exponent,jolicloud/exponent,exponentjs/exponent,jolicloud/exponent,exponent/exponent,exponentjs/exponent,exponent/exponent,jolicloud/exponent,exponentjs/exponent,jolicloud/exponent,exponentjs/exponent,exponent/exponent,exponent/exponent,exponent/exponent,jolicloud/exponent,jolicloud/exponent,exponentjs/exponent,exponentjs/exponent