Fix lock-screen-message.mobileconfig (#25443)

Quick fix now that we have an iPhone fully enrolled in Dogfood.

it-and-security/lib/ios/configuration-profiles/lock-screen-message.mobileconfig

@@ -6,9 +6,9 @@
 	<array>
 		<dict>
 			<key>AssetTagInformation</key>
-			<string>This device is owned by Fleet</string>
+			<string></string>
 			<key>IfLostReturnToMessage</key>
-			<string>Fleet Device Management Inc.</string>
+			<string>This device is property of Fleet Device Management Inc.</string>
 			<key>PayloadDescription</key>
 			<string>Configures ownership information for a shared device</string>
 			<key>PayloadDisplayName</key>