add column And call initializeDB

[zhangshuqi]

must call initializeDB in main.dart to correctly execute add column, or sqfEntity duplicate column error will occur

detail:
DatabaseException(table appLogModel has no column named count: , while compiling: INSERT INTO appLogModel (id, userId, name, content, appVersionCode, appVersionName, platform, deviceId, appChannel, deviceManufacturer, deviceBrand, deviceModel, deviceVersion, count, networkType, createTime) VALUES (NULL, NULL, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)) sql 'INSERT INTO appLogModel (id, userId, name, content, appVersionCode, appVersionName, platform, deviceId, appChannel, deviceManufacturer, deviceBrand, deviceModel, deviceVersion, count, networkType, createTime) VALUES (NULL, NULL, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)'