LogLevel: rename DEFAULT to NOTICE

"DEFAULT" is a bad name - all it says is that it's the default value,
but it doesn't say what it means.  The name NOTICE mimics the syslog
level.

src/db/update/Archive.cxx

@@ -82,8 +82,8 @@ UpdateWalk::UpdateArchiveTree(ArchiveFile &archive, Directory &directory,
 				}
 
 				modified = true;
-				FormatDefault(update_domain, "added %s/%s",
-					      directory.GetPath(), name);
+				FormatNotice(update_domain, "added %s/%s",
+					     directory.GetPath(), name);
 			}
 		} else {
 			if (!song->UpdateFileInArchive(archive)) {

src/db/update/Container.cxx

@@ -75,9 +75,9 @@ UpdateWalk::UpdateContainerFile(Directory &directory,
 			// shouldn't be necessary but it's there..
 			song->mtime = info.mtime;
 
-			FormatDefault(update_domain, "added %s/%s",
-				      contdir->GetPath(),
-				      song->filename.c_str());
+			FormatNotice(update_domain, "added %s/%s",
+				     contdir->GetPath(),
+				     song->filename.c_str());
 
 			{
 				const ScopeDatabaseLock protect;

src/db/update/Remove.cxx

@@ -41,7 +41,7 @@ UpdateRemoveService::RunDeferred() noexcept
 	}
 
 	for (const auto &uri : copy) {
-		FormatDefault(update_domain, "removing %s", uri.c_str());
+		FormatNotice(update_domain, "removing %s", uri.c_str());
 		listener.OnDatabaseSongRemoved(uri.c_str());
 	}
 

src/db/update/UpdateSong.cxx

@@ -76,11 +76,11 @@ try {
 		}
 
 		modified = true;
-		FormatDefault(update_domain, "added %s/%s",
-			      directory.GetPath(), name);
+		FormatNotice(update_domain, "added %s/%s",
+			     directory.GetPath(), name);
 	} else if (info.mtime != song->mtime || walk_discard) {
-		FormatDefault(update_domain, "updating %s/%s",
-			      directory.GetPath(), name);
+		FormatNotice(update_domain, "updating %s/%s",
+			     directory.GetPath(), name);
 		if (!song->UpdateFile(storage)) {
 			FormatDebug(update_domain,
 				    "deleting unrecognized file %s/%s",