Renamed "Demo mode" to "System UI demo mode"

Test: Manually verified string in "Developer options"
Bug: 33694332
Change-Id: I9597b35b4a0a4f475a01ae8712123ca49c8f9b8b
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 3d7a777..8696c7e 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -7691,8 +7691,8 @@
     <!-- [CHAR LIMIT=25] Bluetooth is disabled. -->
     <string name="bluetooth_disabled">Disabled</string>
 
-    <!-- [CHAR LIMIT=60] Name of dev option called demo mode -->
-    <string name="demo_mode">Demo mode</string>
+    <!-- [CHAR LIMIT=60] Name of dev option called "System UI demo mode" -->
+    <string name="demo_mode">System UI demo mode</string>
 
     <!-- Title text for connecting to customer support [CHAR LIMIT=80]-->
     <string name="support_escalation_title">We\'re here to help</string>