this starts at line 176 in PackageSettingsActivity.java

 private void populateColors() {
        if (getResources().getBoolean(R.bool.has_mixable_dual_notification_led)) {
            mColorPref.setEntries(R.array.entries_mixable_dual_led_colors);
            mColorPref.setEntryValues(R.array.values_mixable_dual_led_colors);
        } else if (getResources().getBoolean(R.bool.has_dual_notification_led)) {
            mColorPref.setEntries(R.array.entries_dual_led_colors);
            mColorPref.setEntryValues(R.array.values_dual_led_colors);
        } else {
            mColorPref.setEntries(R.array.entries_trackball_colors);
            mColorPref.setEntryValues(R.array.pref_trackball_colors_values);
        }
    }

how about this:

    private void populateColors() {
        if (getResources().getBoolean(R.bool.has_mixable_dual_notification_led)) {
            mColorPref.setEntries(R.array.entries_mixable_dual_led_colors);
            mColorPref.setEntryValues(R.array.values_mixable_dual_led_colors);
        } else if (getResources().getBoolean(R.bool.has_dual_notification_led)) {
            mColorPref.setEntries(R.array.entries_dual_led_colors);
            mColorPref.setEntryValues(R.array.values_dual_led_colors);
        } else if (getResources().getBoolean(R.bool.has_mixable_single_led)) {
            getPreferenceScreen().removePreference(mColorPref);
        } else {
            mColorPref.setEntries(R.array.entries_trackball_colors);
            mColorPref.setEntryValues(R.array.pref_trackball_colors_values);
        }
    }