CMPartsPreference: Update PreferenceScreen theme

Use the same base theme used for Settings so that our preference
tiles look like the default ones (e.g. add ripple effect).

Change-Id: I27a5569535d8d614a0c0d26dd5b9fcd12f2af1e4

sdk/src/java/org/cyanogenmod/internal/cmparts/CMPartsPreference.java

@@ -51,7 +51,7 @@ public class CMPartsPreference extends RemotePreference {
     }
 
     public CMPartsPreference(Context context, AttributeSet attrs) {
-        this(context, attrs, com.android.internal.R.attr.preferenceScreenStyle);
+        this(context, attrs, android.support.v7.preference.R.attr.preferenceScreenStyle);
     }
 
     @Override