Fix sensor state activity to support right-to-left.

- Need to generate the value as one string
  rather than always putting the unit on the
  right.

MyTracks/res/values/do_not_translate.xml

@@ -49,6 +49,5 @@ limitations under the License.
   <string name="track_action_end">com.google.android.apps.mytracks.END_CURRENT_TRACK</string>
   <string name="track_action_save">android.intent.action.SAVE</string>
   <string name="track_action_start">com.google.android.apps.mytracks.START_NEW_TRACK</string>
-  <string name="unit_percent">%</string>
   <string name="value_unknown">-</string>
  </resources>