Problem:
I introduced a HideCustomAction to hide a command from ribbon through Managed Solution. How to remove HideCustomAction from my Production environment?
Fix:
You can remove the HideCustomAction from Managed solution and reimport the solution in Production environment.
You cannot remove HideCustomAction through Patch solutions. If you have patch solutions installed in Production above base solution which introduced HideCustomAction then you will need to remove this HideCustomAction through Upgrade of Base solution.
Upgrade Solution will remove base and Patch layers installed before and will unhide your command.
Please find more details about HideCustomAction here