Update Wifi off summary text.

Changed the test from "disabled" to off when wifi is turned off.

Fix: 36296257
Test: make RunSettingsRoboTests
Change-Id: Iae421c15b812fa7a5c3ec841e9d2c28d21063884

src/com/android/settings/wifi/WifiSummaryUpdater.java

@@ -75,7 +75,7 @@ public final class WifiSummaryUpdater extends SummaryUpdater {
     @Override
     public String getSummary() {
         if (!mWifiTracker.enabled) {
-            return mContext.getString(R.string.wifi_disabled_generic);
+            return mContext.getString(R.string.switch_off_text);
         }
         if (!mWifiTracker.connected) {
             return mContext.getString(R.string.disconnected);