Fix missing plot title in bode_plot() with display_margins #1250

Job	Run time
Py3.10; no Slycot; no Pandas; no CVXOPT	6m 11s
Py3.10; no Slycot; no Pandas; no CVXOPT	6m 11s
Py3.10; no Slycot; no Pandas; conda CVXOPT	6m 25s
Py3.10; no Slycot; no Pandas; conda CVXOPT	6m 25s
Py3.10; conda Slycot; no Pandas; no CVXOPT	6m 22s
Py3.10; conda Slycot; no Pandas; no CVXOPT	6m 22s
Py3.10; conda Slycot; no Pandas; conda CVXOPT	6m 23s
Py3.10; conda Slycot; no Pandas; conda CVXOPT	6m 23s
Py3.12; no Slycot; no Pandas; no CVXOPT	6m 24s
Py3.12; no Slycot; no Pandas; no CVXOPT	6m 24s
Py3.12; no Slycot; no Pandas; conda CVXOPT	1m 12s
Py3.12; no Slycot; no Pandas; conda CVXOPT	6m 46s
Py3.12; conda Slycot; no Pandas; no CVXOPT	6m 51s
Py3.12; conda Slycot; no Pandas; no CVXOPT	6m 51s
Py3.12; conda Slycot; no Pandas; conda CVXOPT	6m 56s
Py3.12; conda Slycot; no Pandas; conda CVXOPT	6m 56s
Py3.12; conda Slycot; conda Pandas; conda CVXOPT ; QtAgg	1m 27s
Py3.12; conda Slycot; conda Pandas; conda CVXOPT ; QtAgg	7m 32s
Finalize parallel coveralls	4s
Finalize parallel coveralls	3s
	1h 48m 8s

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