Update EllBase Default Port

[slactjohnson]

The default port for the EllBase class is zero:

pcdsdevices/pcdsdevices/lasers/elliptec.py

Line 57 in 9f6e5ee

def __init__(self, prefix, *, channel, port=0, **kwargs):

But recently we updated the IOC to make the default port 15 instead.

The pcdsdevices class should be updated to reflect this.

[KaushikMalapati]

This should be coordinated with updates of thorlabs iocs

Changing the default port is easy enough, you just need to edit the EllBase.init

pcdsdevices/pcdsdevices/lasers/elliptec.py

Line 57 in 9f6e5ee

def __init__(self, prefix, *, channel, port=0, **kwargs):

But it should be coordinated with updates of thorlabs-ell iocs, happi devices, and other instances of elliptec classes that are currently using the default port of zero.