Display contact color in background for generated avatars

Fixes #7028
// FREEBIE

src/org/thoughtcrime/securesms/contacts/avatars/BitmapContactPhoto.java

@@ -37,4 +37,9 @@ public class BitmapContactPhoto implements ContactPhoto {
   public boolean isGenerated() {
     return false;
   }
+
+  @Override
+  public boolean isResource() {
+    return false;
+  }
 }

src/org/thoughtcrime/securesms/contacts/avatars/ContactPhoto.java

@@ -9,5 +9,6 @@ public interface ContactPhoto {
   public Drawable asDrawable(Context context, int color, boolean inverted);
   public Drawable asCallCard(Context context);
   public boolean  isGenerated();
+  public boolean  isResource();
 
 }

src/org/thoughtcrime/securesms/contacts/avatars/GeneratedContactPhoto.java

@@ -55,4 +55,9 @@ public class GeneratedContactPhoto implements ContactPhoto {
   public boolean isGenerated() {
     return true;
   }
+
+  @Override
+  public boolean isResource() {
+    return false;
+  }
 }

src/org/thoughtcrime/securesms/contacts/avatars/ResourceContactPhoto.java

@@ -56,6 +56,11 @@ public class ResourceContactPhoto implements ContactPhoto {
     return false;
   }
 
+  @Override
+  public boolean isResource() {
+    return true;
+  }
+
   private static class ExpandingLayerDrawable extends LayerDrawable {
     public ExpandingLayerDrawable(Drawable[] layers) {
       super(layers);

src/org/thoughtcrime/securesms/contacts/avatars/TransparentContactPhoto.java

@@ -31,4 +31,9 @@ public class TransparentContactPhoto implements ContactPhoto {
   public boolean isGenerated() {
     return false;
   }
+
+  @Override
+  public boolean isResource() {
+    return false;
+  }
 }