FloatOperation in btchipHelpers.py

[St333p]

Importing HWI in my project causes a crash caused by a decimal.Decimal.FloatOperation on line 24 of hwilib/devices/btchip/btchipHelpers.py. It is caused by the conversion of a float into a decimal in Decimal(1e8).

Since importing the library in a python shell in the same virtualenv does work correcly, the issue lies on my side and I'm currently looking into Decimal configurations in my project that might affect this. Nonetheless, I think changing it to Decimal(10**8) would be cleaner. Sorry if this was already discussed, I was not able to find any issues on the matter.