Move horizontal progress bar into SettingsLib.

Remove the horizontal progress bar as it is being moved into
SettingsLib.

Bug: 123538370
Test: See progress bar in wifi settings screen.
Change-Id: I8fc94b1f3a7a52559cfcf89f3e4a604784ec9995

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

@@ -203,7 +203,7 @@ public class WifiSettings extends RestrictedSettingsFragment
         super.onViewCreated(view, savedInstanceState);
         final Activity activity = getActivity();
         if (activity != null) {
-            mProgressHeader = setPinnedHeaderView(R.layout.wifi_progress_header)
+            mProgressHeader = setPinnedHeaderView(R.layout.progress_header)
                     .findViewById(R.id.progress_bar_animation);
             setProgressBarVisible(false);
         }