Custom seekbar pref: allow to refresh values

we need this in some cases
e.g. when the menu has a "reset" option and we need to refresh the
pref values and seekbar position

Change-Id: If9ea4be4432a3e14a507e3dc6c168b6436490cc1
diff --git a/src/com/bliss/support/preferences/CustomSeekBarPreference.java b/src/com/bliss/support/preferences/CustomSeekBarPreference.java
index 2f55784..7e74e42 100644
--- a/src/com/bliss/support/preferences/CustomSeekBarPreference.java
+++ b/src/com/bliss/support/preferences/CustomSeekBarPreference.java
@@ -197,6 +197,11 @@
         persistInt(newValue);
     }
 
+    public void refresh(int newValue) {
+        // this will trigger onProgressChanged and refresh everything
+        mSeekBar.setProgress(newValue - mMin);
+    }
+
     @Override
     public void onStartTrackingTouch(SeekBar seekBar) {
     }