python_ui: update for FAUST 2.0.a30
python_ui: update for FAUST 2.0.a30

This version of FAUST apparently changed the name of the first box to the empty
string, which is just a Null character.

(This is the same change - sans a minor fix in the comment - as in commit
f12d31b1fdcad2b096d1c13d58000863b5727a36.)

marcecj/faust_python