Incorrect param highlighting when params contain a `mapping`

[davidperk]

When a function includes a mapping parameter, the type and name of all parameters beginning with the mapping parameter are incorrectly highlighted.

[davidperk]

Same is true of callbacks.

[davidperk]

Think we can get a fix here @juanfranblanco?

[juanfranblanco]

I tried to fix it, but couldn't, need a better regex