[tutorials] fix since process.pymca has been created

4 jobs for add_larch_process in 5 minutes and 35 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #43755
test:python3.5-stretch-pyqt5_larch

00:03:24

passed #43754
test:python3.5-stretch-pyqt5_pymca

00:05:17

passed #43756
test:python3.5-stretch-pyqt5_pymca_larch

00:05:34

passed #43757
test:test-xas-tutorials_pymca

00:03:19