[bug #68196] [octave forge] (control) Wrong phase in bode plot

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Follow-up Comment #7, bug #68196 (group octave):

Fix seems to work for the specific scenario, but is off by 180 deg for the
following

alpha = 2*pi;
Gf = alpha/(z-(1-alpha));
Gnew = Gf*G

[M,P,W] = bode(Gnew, w);
P(1)*pi/180 -> 1.5698

H = freqresp(Gnew,w);
angle(H)(1) -> -1.5718


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