style(qadb): improve FC charge analysis plots (#466) #1868

Job	Run time
download_test_data (detectors)	5s
download_test_data (physics)	3s
build_timeline	2m 24s
test_swifjob (detectors)	2m 9s
test_swifjob (physics)	2m 4s
run_histogram (physics)	3m 19s
run_histogram (detectors)	2m 44s
run_analysis (physics)	1m 42s
run_analysis (detectors)	8m 31s
	23m 1s

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