Spektrum Analizer Producing Wrong Results

[spatzengr]

see https://www.rcgroups.com/forums/showpost.php?p=39190505&postcount=53831

the recent commit has some unintended consequences. 9da966f

@basdelfos

[spatzengr]

CF BBE 2.5.11: Expected peak motor noise in 200hz range.

BF BBE 3.0.0-RC1: Commit merged resulted in peak motor noise being doubled.

[basdelfos]

Fixed with #106