Fixed percent error by adjust the starting point of the window to the
last know edge. This allows for the decoding of any length input of 25Hz
Manchester (IEEE) bits with 15kHz high states and 0kHz low state.

Added new test file
"HeadsetSensor_in_25Hz_15kHzOne_0xCAFEBABEDEADBEEFFACC310400104713_44kSR_SE_i5s.txt"