Don't set color for new collections

Color should be NULL for new EteSync collections if color has not been set explicitly by user.

resources/etesync/etesyncresource.cpp

@@ -572,7 +572,6 @@ void EteSyncResource::collectionAdded(const Akonadi::Collection &collection, con
     const QString type = getEtebaseTypeForCollection(collection);
     EtebaseItemMetadataPtr collectionMetaData(etebase_item_metadata_new());
     etebase_item_metadata_set_name(collectionMetaData.get(), collection.displayName());
-    etebase_item_metadata_set_color(collectionMetaData.get(), ETESYNC_DEFAULT_COLLECTION_COLOR);
     etebase_item_metadata_set_mtime(collectionMetaData.get(), &modificationTimeSinceEpoch);
 
     qCDebug(ETESYNC_LOG) << "Created metadata";

resources/etesync/loginjob.cpp

@@ -78,7 +78,6 @@ void LoginJob::createDefaultCollection(const QString &collectionType, const QStr
     int64_t modificationTimeSinceEpoch = QDateTime::currentMSecsSinceEpoch();
     EtebaseItemMetadataPtr collectionMetaData(etebase_item_metadata_new());
     etebase_item_metadata_set_name(collectionMetaData.get(), collectionName);
-    etebase_item_metadata_set_color(collectionMetaData.get(), ETESYNC_DEFAULT_COLLECTION_COLOR);
     etebase_item_metadata_set_mtime(collectionMetaData.get(), &modificationTimeSinceEpoch);
 
     qCDebug(ETESYNC_LOG) << "Created metadata";