[backend] bugfix directory already exists, when another user created that

Author: aahnik

server/src/spaces/spaces.service.ts

@@ -113,6 +113,7 @@ export class SpacesService {
     );
 
     const existingFileObject = await this.filesModel.findOne({
+      owner: createFileDto.owner,
       spaceParent: createFileDto.spaceParent,
       fileName: createFileDto.fileName,
     });