fix(sync): Clear pending autosync calls on close

This would normally happen in the save call before closing.
However if that call fails
(for example due to a conflict)
we still clear the pending autosync calls to prevent 403s.

Fixes #4080.

Signed-off-by: Max <[email protected]>

Author: max-nextcloud

src/services/SyncService.js

@@ -284,6 +284,8 @@ class SyncService {
 	}
 
 	async close() {
+		// Make sure to leave no pending requests behind.
+		this.autosave.clear()
 		this.backend?.disconnect()
 		return this._close()
 	}