Fix image messages being dropped in profile chats

It looks like profile chats are created as public chats, and the code
will drop messages for it.

This commit fixes the issue by checking for the "@" prefix in profile
chat names, until we fix the issue by migrating those chats.

VERSION

@@ -1 +1 @@
-0.71.1
+0.71.2

protocol/message_handler.go

@@ -4,6 +4,7 @@ import (
 	"crypto/ecdsa"
 	"encoding/hex"
 	"fmt"
+	"strings"
 
 	"github.com/pkg/errors"
 
@@ -423,7 +424,9 @@ func (m *MessageHandler) HandleChatMessage(state *ReceivedMessageState) error {
 		return err // matchChatEntity returns a descriptive error message
 	}
 
-	if chat.Public() && receivedMessage.ContentType == protobuf.ChatMessage_IMAGE {
+	// It looks like status-react created profile chats as public chats
+	// so for now we need to check for the presence of "@" in their chatID
+	if chat.Public() && receivedMessage.ContentType == protobuf.ChatMessage_IMAGE && !strings.HasPrefix(chat.ID, "@") {
 		return errors.New("images are not allowed in public chats")
 	}