GLTFLoader: Fix safariVersion not found on chrome iOS#28712

Mugen87 merged 1 commit intomrdoob:devmrdoob/three.js:devfrom

RenaudRohlinger:utsubo/fix/gltf-loader-useragentRenaudRohlinger/three.js:utsubo/fix/gltf-loader-useragentCopy head branch name to clipboard