Added a background to emoji variations popup

app/src/main/java/org/thoughtcrime/securesms/components/emoji/EmojiVariationSelectorPopup.java

@@ -1,6 +1,7 @@
 package org.thoughtcrime.securesms.components.emoji;
 
 import android.content.Context;
+import android.graphics.drawable.ColorDrawable;
 import android.view.LayoutInflater;
 import android.view.ViewGroup;
 import android.widget.ImageView;
@@ -8,6 +9,8 @@ import android.widget.PopupWindow;
 
 import androidx.annotation.NonNull;
 
+import org.session.libsession.utilities.ThemeUtil;
+
 import java.util.List;
 
 import network.loki.messenger.R;
@@ -26,7 +29,9 @@ public class EmojiVariationSelectorPopup extends PopupWindow {
     this.listener = listener;
     this.list     = (ViewGroup) getContentView();
 
-    setBackgroundDrawable(null);
+    setBackgroundDrawable(
+            new ColorDrawable(ThemeUtil.getThemedColor(context, R.attr.colorPrimary))
+    );
     setOutsideTouchable(true);
   }