style(qadb): improve FC charge analysis plots #1867

Job	Run time
download_test_data (physics)	4s
download_test_data (detectors)	4s
build_timeline	2m 0s
run_histogram (physics)	2m 57s
test_swifjob (detectors)	2m 8s
run_histogram (detectors)	2m 46s
test_swifjob (physics)	2m 8s
run_analysis (detectors)	8m 30s
run_analysis (physics)	1m 42s
	22m 19s

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