chore: Follow up create group

lib/pages/new_group/new_group_view.dart

@@ -42,11 +42,14 @@ class NewGroupView extends StatelessWidget {
                       radius: Avatar.defaultSize / 2,
                       child: avatar == null
                           ? const Icon(Icons.camera_alt_outlined)
-                          : Image.memory(
+                          : ClipRRect(
-                              avatar,
+                              borderRadius: BorderRadius.circular(90),
-                              width: Avatar.defaultSize,
+                              child: Image.memory(
-                              height: Avatar.defaultSize,
+                                avatar,
-                              fit: BoxFit.cover,
+                                width: Avatar.defaultSize,
+                                height: Avatar.defaultSize,
+                                fit: BoxFit.cover,
+                              ),
                             ),
                     ),
                   ),

lib/pages/new_private_chat/new_private_chat_view.dart

@@ -29,7 +29,7 @@ class NewPrivateChatView extends StatelessWidget {
         min(MediaQuery.of(context).size.width - 16, 256).toDouble();
     return Scaffold(
       appBar: AppBar(
-        scrolledUnderElevation: Theme.of(context).appBarTheme.elevation,
+        scrolledUnderElevation: 0,
         leading: const Center(child: BackButton()),
         title: Text(L10n.of(context)!.newChat),
         backgroundColor: Theme.of(context).scaffoldBackgroundColor,