spectrogram: allows better visualization of low frequencies

spectrogram: allows better visualization of low frequencies

In some cases, Y which represents the height of a column was equal to 1
and therefore when passed through the log, the output displayed was
zero, by adding this 0.1, this allows you to see a column when y = 1
without really changing the height of each column

(cherry picked from commit c347fed91e76bd31387171e1ff67224c21194362)

Gbp-Pq: Name 0017-spectrogram-allows-better-visualization-of-low-frequ.patch