Add meta tag to allow full screen app on iOS

Fixes #933.

src/browser/workbench-build.html

@@ -40,6 +40,7 @@
 		<link rel="manifest" href="./manifest.json">
 		<link rel="apple-touch-icon" href="./static-{{COMMIT}}/out/vs/server/src/media/code-server.png" />
 		<link data-name="vs/workbench/workbench.web.api" rel="stylesheet" href="./static-{{COMMIT}}/out/vs/workbench/workbench.web.api.css">
+		<meta name="apple-mobile-web-app-capable" content="yes">
 
 		<!-- Prefetch to avoid waterfall -->
 		<link rel="prefetch" href="./static-{{COMMIT}}/node_modules/semver-umd/lib/semver-umd.js">