Always set card background color

app/src/main/java/eu/faircode/email/ViewCardOptional.java

@@ -37,7 +37,6 @@ public class ViewCardOptional extends CardView {
     private boolean threading;
     private int margin;
     private int ident;
-    private Integer color = null;
 
     public ViewCardOptional(@NonNull Context context) {
         super(context);
@@ -83,9 +82,6 @@ public class ViewCardOptional extends CardView {
 
     @Override
     public void setCardBackgroundColor(int color) {
-        if (this.color == null || this.color != color) {
-            this.color = color;
-
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getContext());
         boolean cards = prefs.getBoolean("cards", true);
         if (cards && color == Color.TRANSPARENT)
@@ -93,7 +89,6 @@ public class ViewCardOptional extends CardView {
 
         super.setCardBackgroundColor(color);
     }
-    }
 
     public void setOutgoing(boolean outgoing) {
         if (cards && threading && indentation) {