Fix for overflow issues with +10dB test cases in sns_shape_spectrum

[x] Dynamic Q-factor is used and passed to sns_shape_spectrum() instead of static Q-factor to avoid overflow and to increase precision.

Pytests results:
573 failed, 1 passed, 381 skipped - For original inputs, +10dB scaled and -10dB scaled

MLD results:
Original inputs: 1 case > 5
+10dB scaled: 9 cases > 5