Fix wrong method name - copy/paste error from FlBinaryMessenger (#18596)

shell/platform/linux/fl_basic_message_channel.cc

@@ -206,7 +206,7 @@ G_MODULE_EXPORT void fl_basic_message_channel_send(FlBasicMessageChannel* self,
       g_steal_pointer(&task));
 }
 
-G_MODULE_EXPORT FlValue* fl_basic_message_channel_send_on_channel_finish(
+G_MODULE_EXPORT FlValue* fl_basic_message_channel_send_finish(
     FlBasicMessageChannel* self,
     GAsyncResult* result,
     GError** error) {

shell/platform/linux/public/flutter_linux/fl_basic_message_channel.h

@@ -187,8 +187,7 @@ void fl_basic_message_channel_send(FlBasicMessageChannel* channel,
  *
  * Returns: message response on success or %NULL on error.
  */
-FlValue* fl_basic_message_channel_send_on_channel_finish(
-    FlBasicMessageChannel* channel,
+FlValue* fl_basic_message_channel_send_finish(FlBasicMessageChannel* channel,
                                               GAsyncResult* result,
                                               GError** error);