Fix bug where the target is incorrectly set (#1427)
Fix bug where the target is incorrectly set (#1427)

"stage === (`build-html` || `develop-html`)" is the equivalent of "stage === `build-html`". When the stage is `develop-html`, target incorrectly evaluates to `web` instead of `node`.
ChristopherBiscardi/gatsby,mingaldrichgan/gatsby,fk/gatsby,gatsbyjs/gatsby,chiedo/gatsby,fk/gatsby,fabrictech/gatsby,okcoker/gatsby,0x80/gatsby,ChristopherBiscardi/gatsby,danielfarrell/gatsby,fabrictech/gatsby,okcoker/gatsby,ChristopherBiscardi/gatsby,0x80/gatsby,mingaldrichgan/gatsby,gatsbyjs/gatsby,chiedo/gatsby,Khaledgarbaya/gatsby,danielfarrell/gatsby,chiedo/gatsby,danielfarrell/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,mickeyreiss/gatsby,fabrictech/gatsby,gatsbyjs/gatsby,mickeyreiss/gatsby,okcoker/gatsby,mingaldrichgan/gatsby,Khaledgarbaya/gatsby,gatsbyjs/gatsby,mickeyreiss/gatsby,Khaledgarbaya/gatsby,0x80/gatsby,fk/gatsby