fix: Removed bubble for giphy, changed border radii

lib/src/giphy_attachment.dart

@@ -266,7 +266,16 @@ class GiphyAttachment extends StatelessWidget {
     return Container(
       child: Column(
         children: [
-          CachedNetworkImage(
+          Container(
+            decoration: BoxDecoration(
+              borderRadius: BorderRadius.only(
+                topRight: Radius.circular(8.0),
+                bottomRight: Radius.circular(0.0),
+                topLeft: Radius.circular(8.0),
+                bottomLeft: Radius.circular(8.0),
+              ),
+            ),
+            child: CachedNetworkImage(
               height: size?.height,
               width: size?.width,
               placeholder: (_, __) {
@@ -287,6 +296,7 @@ class GiphyAttachment extends StatelessWidget {
               ),
               fit: BoxFit.cover,
             ),
+          ),
           Padding(
             padding: const EdgeInsets.symmetric(vertical: 8.0),
             child: Row(