Small fixes for AGN notebook

[hombit]

Little fixes to the AGN notebook

[review-notebook-app]

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Before [07ebd35]	After [f9867d6]	Ratio	Benchmark (Parameter)
116±4μs	127±3μs	1.09	benchmarks.TimeSuite.time_evaluate_simple_linear_wavelength_model
710±10μs	755±50μs	1.06	benchmarks.TimeSuite.time_fnu_to_flam
4.46±0.02ms	4.58±0.1ms	1.03	benchmarks.TimeSuite.time_evaluate_salt3_passbands
19.2±0.2ms	19.5±0.2ms	1.02	benchmarks.TimeSuite.time_make_and_evaluate_static_sed
48.1±0.4μs	48.6±0.9μs	1.01	benchmarks.TimeSuite.time_make_new_salt3_model
1.03±0s	1.04±0.02s	1.01	benchmarks.TimeSuite.time_make_x1_from_hostmass
8.59±0.04ms	8.58±0.06ms	1	benchmarks.TimeSuite.time_load_passbands
90.8±2μs	90.9±1μs	1	benchmarks.TimeSuite.time_make_and_evaluate_step_model
11.0±0.09ms	11.0±0.07ms	1	benchmarks.TimeSuite.time_make_evaluate_constant_sed_model
30.7±0.5μs	30.7±0.6μs	1	benchmarks.TimeSuite.time_make_simple_linear_wavelength_model

Click here to view all benchmarks.