Other locations to look for:
plugins/system/t4/admin/theme/index.php: <meta name="apple-mobile-web-app-capable" content="YES" />
plugins/system/t4/themes/base/html/layouts/t4/edit.php: <meta name="apple-mobile-web-app-capable" content="YES"/>
plugins/system/t4/themes/base/html/layouts/t4/index.php: <meta name="apple-mobile-web-app-capable" content="YES"/>
I have SSH access and search with this command all files:
grep -ri "apple-mobile-web-app" *
Just unpack and overwrite to plugin directory... Works only for T4