Jupyter Viz: Don't avoid interactive backend

[EwoutH]

We were avoiding the interactive backend, but that isn't recommended anymore and Solara should take care of that itself.

Removing this resolves this bug:

For some reason, regular matplotlib and seaborn plots don't show anymore after a Solara page has been initiated. In the code below you can see the first seaborn plot showing well, but the second not showing.

In PyCharm, the first plot is also shown fine, but instead of just not showing the second plot anymore, but gives an error:

ipykernel_29332\2165788151.py:2: UserWarning: FigureCanvasAgg is non-interactive, and thus cannot be shown
  plt.show()

For details, see widgetti/solara#703, which this PR resolves.

[github-actions]

Performance benchmarks:

Model	Size	Init time [95% CI]	Run time [95% CI]
Schelling	small	🔵 -0.3% [-0.6%, +0.0%]	🔵 +0.3% [+0.2%, +0.5%]
Schelling	large	🔵 -0.5% [-0.9%, -0.1%]	🔵 +1.2% [-0.9%, +3.2%]
WolfSheep	small	🔵 +0.5% [-0.4%, +1.3%]	🔵 +1.5% [+1.2%, +1.8%]
WolfSheep	large	🔵 +0.2% [-0.3%, +0.7%]	🔵 +1.2% [+0.1%, +2.4%]
BoidFlockers	small	🔵 -0.9% [-1.6%, -0.2%]	🔵 -3.1% [-3.9%, -2.3%]
BoidFlockers	large	🔵 -1.3% [-1.6%, -0.9%]	🔵 -2.0% [-2.8%, -1.3%]