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

Test: Manually verified string in "Developer options"
Bug: 33694332
Change-Id: Ib47adda7e2637c8f3c0cee5f64ed7054e5b3c6f1
diff --git a/packages/SystemUI/res/values/strings.xml b/packages/SystemUI/res/values/strings.xml
index 31b83cc..6246edf 100644
--- a/packages/SystemUI/res/values/strings.xml
+++ b/packages/SystemUI/res/values/strings.xml
@@ -1166,8 +1166,8 @@
     <!-- Name of overview -->
     <string name="overview">Overview</string>
 
-    <!-- Name of demo mode (mode with preset icons for screenshots) -->
-    <string name="demo_mode">Demo mode</string>
+    <!-- Name of System UI demo mode (mode with preset icons for screenshots) -->
+    <string name="demo_mode">System UI demo mode</string>
 
     <!-- Enable demo mode -->
     <string name="enable_demo_mode">Enable demo mode</string>