更新像素清空按钮的重置颜色值。重置后为黑色，透明度OriginalAlpha值为FF。

powerbell/src/main/java/cc/winboll/studio/powerbell/activities/BackgroundSettingsActivity.java

@@ -323,7 +323,7 @@ public class BackgroundSettingsActivity extends WinBoLLActivity {
             LogUtils.d(TAG, "【按钮点击】清空像素颜色");
             BackgroundBean bean = mBgSourceUtils.getPreviewBackgroundBean();
             int oldColor = bean.getPixelColor();
-            bean.setPixelColor(0);
+            bean.setPixelColor(0xFF000000);
             mBgSourceUtils.saveSettings();
             doubleRefreshPreview();
 			isPreviewBackgroundChanged = true;