Archive*: move archive_domain to ArchiveDomain.cxx

Merge duplicate symbol.

src/input/ArchiveInputPlugin.cxx

@@ -19,20 +19,18 @@
 
 #include "config.h"
 #include "ArchiveInputPlugin.hxx"
+#include "ArchiveDomain.hxx"
 #include "ArchiveLookup.hxx"
 #include "ArchiveList.hxx"
 #include "ArchivePlugin.hxx"
 #include "ArchiveFile.hxx"
 #include "InputPlugin.hxx"
 #include "util/Error.hxx"
-#include "util/Domain.hxx"
 #include "fs/Path.hxx"
 #include "Log.hxx"
 
 #include <glib.h>
 
-static constexpr Domain archive_domain("archive");
-
 /**
  * select correct archive plugin to handle the input stream
  * may allow stacking of archive plugins. for example for handling