[GOG]: avoid removing folder_name between library refresh (#2814)

Author: imLinguin

src/backend/storeManagers/gog/games.ts

@@ -328,7 +328,7 @@ export async function install(
     ? await getLinuxInstallerInfo(appName)
     : null
 
-  if (gameInfo.folder_name === undefined) {
+  if (gameInfo.folder_name === undefined || gameInfo.folder_name.length === 0) {
     logError('game info folder is undefined in GOG install', LogPrefix.Gog)
     return { status: 'error' }
   }

src/backend/storeManagers/gog/library.ts

@@ -194,6 +194,10 @@ export async function refresh(): Promise<ExecResult> {
       }
       const unifiedObject = await gogToUnifiedInfo(data, product?.data)
       if (unifiedObject.app_name) {
+        const oldData = library.get(unifiedObject.app_name)
+        if (oldData) {
+          unifiedObject.folder_name = oldData.folder_name
+        }
         gamesObjects.push(unifiedObject)
       }
       const installedInfo = installedGames.get(String(game.external_id))