Add translatable="false" for pref_camera_id_default.

bug:3013075
Change-Id: Id50bdb1cb8e1cd5750edb80102ac10aea43debe3
diff --git a/res/values/strings.xml b/res/values/strings.xml
index b3cff4a..35de6a6 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -108,7 +108,7 @@
     <!-- Settings screen, camera selection dialog title. Users can select a camera from the phone (front-facing or back-facing). [CHAR LIMIT=20] -->
     <string name="pref_camera_id_title">Select camera</string>
 
-    <string name="pref_camera_id_default">0</string>
+    <string name="pref_camera_id_default" translatable="false">0</string>
 
     <!-- In select camera setting, back facing camera. [CHAR LIMIT=14] -->
     <string name="pref_camera_id_entry_back">Back</string>