Nyquist plot uses incorrect subplot axes

import control as ctl
import matplotlib.pyplot as plt
P = ctl.tf([1], [2, 1])

fig, ax = plt.subplots(2,2)
ctl.nyquist_plot(P, ax=ax[1,0])
plt.show()

The nyquist plot always shows up in the botom right corner, no matter what index into ax I use.

When I replace the nyquist with step, it shows up at the correct position (bottom left in this case):

fig, ax = plt.subplots(2,2)
ctl.step_response(P).plot(ax=ax[1,0])
plt.show()

Version: control==0.10.1

@JonHowMIT

This was also pointed out by @JonHowMIT in #1143.

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