[fix] Disable separate selector characters for PDF and XML

Lagrange does not recocnise 'P' and 'X' types as links.

gopherType.go

@@ -90,14 +90,8 @@ func (params *GopherTypeCharParams) GopherTypeChar(path string, isDir bool) stri
 			return "I"
 		case strings.HasPrefix(mimeType, "audio/"):
 			return "s"
-		case mimeType == "application/pdf":
-			return "P"
 		case strings.HasPrefix(mimeType, "text/html"):
 			return "h"
-		case strings.HasPrefix(mimeType, "text/rtf"):
-			return "r"
-		case strings.HasPrefix(mimeType, "text/xml") || strings.HasPrefix(mimeType, "application/xml"):
-			return "X"
 		default:
 			return "9"
 	}