Test suite: remove XXX from scenarios using the updated checkpoint (refs: #16004).

features/usb_install.feature

@@ -68,14 +68,12 @@ Feature: Installing Tails to a USB drive
     Then the running Tails is installed on USB drive "install"
     And there is no persistence partition on USB drive "install"
 
-  # XXX: do this without Tails Installer
   Scenario: Booting Tails from a USB drive without a persistent partition and creating one
     Given I have started Tails without network from a USB drive without a persistent partition and stopped at Tails Greeter's login screen
     And I log in to a new session
     When I create a persistent partition
     Then a Tails persistence partition exists on USB drive "__internal"
 
-  # XXX: do this without Tails Installer
   Scenario: Booting Tails from a USB drive without a persistent partition
     Given I have started Tails without network from a USB drive without a persistent partition and stopped at Tails Greeter's login screen
     When I log in to a new session
@@ -83,7 +81,6 @@ Feature: Installing Tails to a USB drive
     And the persistent Tor Browser directory does not exist
     And there is no persistence partition on USB drive "__internal"
 
-  # XXX: do this without Tails Installer
   #13459
   @fragile
   Scenario: Booting Tails from a USB drive in UEFI mode

features/usb_upgrade.feature

@@ -80,7 +80,6 @@ Feature: Upgrading an old Tails USB installation
 
   # Depends on scenario: Writing files to a read/write-enabled persistent partition with the old Tails USB installation
   Scenario: Upgrading an old Tails USB installation from another Tails USB drive
-    # XXX: ensure we do this Given without Tails Installer (usb-install-tails-greeter)
     Given I have started Tails without network from a USB drive without a persistent partition and stopped at Tails Greeter's login screen
     And I log in to a new session
     And I clone USB drive "old" to a new USB drive "to_upgrade"