extensions: removing a bunch of useless semicolon on Python script.
Probably forgotten remnants from the C to Python port, as I copy-pasted the C plug-in and converted each line of code to Python 3, one by one. These semicolons are not breaking the plug-in, but that is still not very "Python-style". Let's say it's valid, though useless in this case and clearly not considered beautiful Python.
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