Use folder color for folder swipe icon color

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

@@ -102,8 +102,8 @@ public interface DaoAccount {
     LiveData<List<TupleAccountView>> liveAccountView();
 
     @Query("SELECT account.id" +
-            ", account.swipe_left, l.type AS left_type, l.name AS left_name" +
-            ", account.swipe_right, r.type AS right_type, r.name AS right_name" +
+            ", account.swipe_left, l.type AS left_type, l.name AS left_name, l.color AS left_color" +
+            ", account.swipe_right, r.type AS right_type, r.name AS right_name, r.color AS right_color" +
             " FROM account" +
             " LEFT JOIN folder l ON l.id = account.swipe_left" +
             " LEFT JOIN folder r ON r.id = account.swipe_right" +

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

@@ -1733,6 +1733,8 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
             if (dX > 0) {
                 // Right swipe
                 d.setAlpha(Math.round(255 * Math.min(dX / (2 * margin + size), 1.0f)));
+                if (swipes.right_color != null)
+                    d.setTint(swipes.right_color);
                 int padding = (rect.height() - size);
                 d.setBounds(
                         rect.left + margin,
@@ -1743,6 +1745,8 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
             } else if (dX < 0) {
                 // Left swipe
                 d.setAlpha(Math.round(255 * Math.min(-dX / (2 * margin + size), 1.0f)));
+                if (swipes.left_color != null)
+                    d.setTint(swipes.left_color);
                 int padding = (rect.height() - size);
                 d.setBounds(
                         rect.left + rect.width() - size - margin,

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

@@ -24,7 +24,9 @@ public class TupleAccountSwipes {
     public Long swipe_left;
     public String left_type;
     public String left_name;
+    public Integer left_color;
     public Long swipe_right;
     public String right_type;
     public String right_name;
+    public Integer right_color;
 }