The command "/unbind <key>" will reset a specific key to it's original utility, the command "/unbindall" does this for all keys. The slash command to deselect your target is "/unselect" so the following command will bind a key to deselect your current target: /bind <key> "unselect"
Also a related option you might need the command /bind <key> "nop" will remove all binds from a key (including the default utility).
You can also use the command "/showbind <key>" to see what a key currently does.
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Long story short, /unbind is the command you want 
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I set the Esc key as a keybind then realised how much I use it as a deslect target key.
How do I clear all keybinds so everything is back to default
How do I change a keybind to deselect target
Thanks