Revert "Update tests to match precision change"

This reverts commit 08163ad91d42c0eef8ec0d9e99052e4ebb3a9415.
Revert "Add precision to printed frequency values"

This reverts commit eb8765aa76af40134a77824b22dbfaca1bf0e597.
Add precision to printed frequency values and update tests to match

The point in adding precision to printed frequency
values is to avoid rounding of the frequencies, which would give
incorrect values. Now it's possible to use 0.05MHz increments and
have all the scanned frequencies printed in that accuracy.