chore: fix errenous windows paths from previous migration

packages/desktop/app/javascripts/Main/Remote/RemoteBridge.ts

@@ -76,6 +76,7 @@ export class RemoteBridge implements CrossProcessBridge {
       migrateLegacyFileBackupsToNewStructure: this.migrateLegacyFileBackupsToNewStructure.bind(this),
       getUserDocumentsDirectory: this.getUserDocumentsDirectory.bind(this),
       monitorPlaintextBackupsLocationForChanges: this.monitorPlaintextBackupsLocationForChanges.bind(this),
+      joinPaths: this.joinPaths.bind(this),
     }
   }
 
@@ -235,6 +236,10 @@ export class RemoteBridge implements CrossProcessBridge {
     return this.fileBackups.monitorPlaintextBackupsLocationForChanges(backupsDirectory)
   }
 
+  joinPaths(...paths: string[]): Promise<string> {
+    return this.fileBackups.joinPaths(...paths)
+  }
+
   askForMediaAccess(type: 'camera' | 'microphone'): Promise<boolean> {
     return this.media.askForMediaAccess(type)
   }