Params hash table in Get-TppCertificate

[azirish1998]

If you're pipelining multiple objects into Get-TppCertificate and you use an option like -IncludePrivateKey, you get an error where you are trying to "re-add" the key to the hashtable. I think you need to re-initialize the params hash in process{}

[gdbarron]

Thanks @azirish1998. Looks like I've made that mistake in a few places, I'll get that cleaned up.