Problem generating restore scripts for multiple ola backups
I posted this in the comments section but I feel this should give you an answer that is simpler and cleaner.

https://paulbrewer.wordpress.com/sp_restoregene/

Simply install the script and run sp_Restoregene.  You can pass it @database and @stopat too.

This script will script all the restore scripts automagically for you.  Including FULLs, DIFFs and LOGs (in order).

This script has saved my bacon more times than I can count!