The hw_wallet and jade plugins were being included twice in the pyinstaller binaries.
They were apparently the only two plugins being picked as "modules" (a.pure),
which by default are included as compiled-bytecode.
In addition, we included "electrum/plugins" as data (a.data), which meant all
plugins in source form.
Instead of hacking around to fix the specific issue, this attempts a larger clean-up.
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