Strings: drop unused X Pass strings

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

@@ -565,11 +565,9 @@
     <string name="action_upgrade">Unlock all features</string>
     <string name="billing_action_subscribe">Subscribe</string>
     <string name="billing_action_manage_subscriptions">Manage subscriptions</string>
-    <string name="billing_action_pass">Get X Pass App</string>
     <string name="billing_duration_format">%1$s/year</string>
     <string name="billing_free_trial">Free trial</string>
     <string name="billing_sub_description">Try for 30 days, cancel any time.</string>
-    <string name="billing_price_pass">one-time purchase</string>
     <string name="upgrade_description">Every subscription unlocks all features and supports future updates. A subscription is not required to use this app.</string>
     <string name="upgrade_success">Thanks for supporting SeriesGuide! You have access to all features.</string>
     <string name="billing_unlock_detected">X Pass app detected. You may still subscribe to support future updates.</string>