Count the params as we add them to the param arrays and use that to
update the stream params instead of using hardcoded indexes and sizes.
This makes it easier to add params and it also revealed a miscounted
param.
There is no need to encode the potential format in the format.dsp of
control ports, this is just for legacy compatibility with JACK apps. The
actual format can be negotiated with the types field.
Fixes midi port visibility with apps compiled against 1.2, such as JACK
apps in flatpaks.
