fix(pwa): add mobile-web-app-capable meta tag

Chrome deprecated apple-mobile-web-app-capable in favor of the
standard mobile-web-app-capable. Add the new tag while keeping the
Apple variant for iOS Safari compatibility.

server/src/ledgrab/templates/index.html

@@ -7,6 +7,7 @@
     <link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='0.9em' font-size='90'>💡</text></svg>">
     <!-- PWA -->
     <meta name="theme-color" content="#1a1a1a">
+    <meta name="mobile-web-app-capable" content="yes">
     <meta name="apple-mobile-web-app-capable" content="yes">
     <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
     <meta name="apple-mobile-web-app-title" content="LED Grab">