使用预设颜色，避免随机生成的奇怪颜色

src/com/hippo/ehviewer/ui/SettingsActivity.java

@@ -128,7 +128,7 @@ public class SettingsActivity extends AbstractPreferenceActivity {
         super.onCreate(savedInstanceState);
 
         // Set random color
-        int color = Config.getRandomThemeColor() ? Theme.getRandomDeepColor() : Config.getThemeColor();
+        int color = Config.getRandomThemeColor() ? Theme.getRandomDarkColor() : Config.getThemeColor();
         color = color & 0x00ffffff | 0xdd000000;
         Drawable drawable = new ColorDrawable(color);
         final ActionBar actionBar = getActionBar();