updated feature flag key to match server

core/src/main/kotlin/com/bitwarden/core/data/manager/model/FlagKey.kt

@@ -135,7 +135,7 @@ sealed class FlagKey<out T : Any> {
      * Data object holding the feature flag key for the Manage Devices feature.
      */
     data object ManageDevices : FlagKey<Boolean>() {
-        override val keyName: String = "pm-4516-manage-devices"
+        override val keyName: String = "pm-4516-devices-add-last-activity-date"
         override val defaultValue: Boolean = false
     }
 

core/src/test/kotlin/com/bitwarden/core/data/manager/model/FlagKeyTest.kt

@@ -60,6 +60,10 @@ class FlagKeyTest {
             FlagKey.NewItemTypes.keyName,
             "pm-32009-new-item-types",
         )
+        assertEquals(
+            FlagKey.ManageDevices.keyName,
+            "pm-4516-devices-add-last-activity-date",
+        )
     }
 
     @Test
@@ -79,6 +83,7 @@ class FlagKeyTest {
                 FlagKey.V2EncryptionPassword,
                 FlagKey.V2EncryptionTde,
                 FlagKey.NewItemTypes,
+                FlagKey.ManageDevices,
             ).all {
                 !it.defaultValue
             },