feat: Adjust download size calculation for incremental updates

Currently, the download size for packages in incremental update mode
is set to half of the original size. This is a temporary measure
and will be improved in future updates.

Author: electricface

src/lastore-daemon/manager_ifc.go

@@ -490,6 +490,11 @@ func (m *Manager) QueryAllSizeWithSource(mode system.UpdateType) (int64, *dbus.E
 		logger.Infof("%v size is:%v M", strings.Join(sourcePathList, " and "), int64(allSize/(1000*1000)))
 	}
 
+	// TODO: Currently, just use half of the original size. This needs to be improved in the future.
+	if m.config.IncrementalUpdate {
+		allSize = allSize / 2
+	}
+
 	return int64(allSize), dbusutil.ToError(err)
 }