android/ui: string change

tailscale -> Tailscale

Co-authored-by: Andrea Gottardo <andrea@tailscale.com>
Signed-off-by: Jonathan Nobels <jnobels@gmail.com>

android/src/main/res/values/strings.xml

@@ -201,7 +201,7 @@
     <string name="taildrop_share_failed_title">Taildrop Failed</string>
 
     <!-- Strings for the intro screen -->
-    <string name="tailscale">tailscale</string>
+    <string name="tailscale">Tailscale</string>
     <string name="getStarted">Get Started</string>
     <string name="welcome1">Tailscale is a mesh VPN for securely connecting your devices. All connections are device-to-device, so we never see your data.\n\nWe collect and use your email address and name, as well as your device name, OS version, and IP address in order to help you to connect your devices and manage your settings. We log when you are connected to your network.\n</string>