[Rspamd] Remove deprecated attachments_only in AV module

[Rspamd] Remove old symbol score

data/conf/rspamd/local.d/antivirus.conf

@@ -1,5 +1,5 @@
 clamav {
-  attachments_only = true;
+  scan_mime_parts = true;
   symbol = "CLAM_VIRUS";
   type = "clamav";
   log_clean = true;

data/conf/rspamd/local.d/metrics.conf

@@ -26,12 +26,6 @@ group "MX" {
 	  one_shot = "true";
 	}
 }
-
-symbol "SPOOFED_SENDER" {
-	description = "Sender is not authenticated but part of mailcow managed domains";
-	score = 1.0;
-}
-
 symbol "CTYPE_MIXED_BOGUS" {
   score = 0.0;
 }