Change stop_probabilities to get_attenuation_stop_probabilities in transcript elongation config

[U8NWXD]

In ecoli/library/sim_data.py, we include a key stop_probabilities in the transcript elongation configuration:

vivarium-ecoli/ecoli/library/sim_data.py

Line 372 in 7946e51

'stop_probabilities': self.sim_data.process.transcription.get_attenuation_stop_probabilities,

However, the process actually expects a get_attenuation_stop_probabilities parameter:

vivarium-ecoli/ecoli/processes/transcript_elongation.py

Line 113 in 7946e51

'get_attenuation_stop_probabilities': (