Fix optimistic manifest behavior in AppLoader (fixes history in home)
Fix optimistic manifest behavior in AppLoader (fixes history in home)

fbshipit-source-id: 1218aa5

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