fix Bar trace 'base' attr #171

Job	Run time
Clippy	4m 47s
Build Book	3m 49s
Code Coverage	17s
Build Wasm Examples (callback-example)	1m 1s
semver	43s
Rustfmt	15s
Tests (macos-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 15s
Tests (windows-latest, chrome, plotly_ndarray,plotly_image,static_export_chromedriver,debug)	7m 21s
Tests (ubuntu-latest, chrome, plotly_ndarray,plotly_image,static_export_default,debug)	3m 28s
Build Wasm Examples (basic)	1m 2s
Build Examples (customization/density_mapbox_example)	28s
Build Examples (basic_charts)	34s
Build Examples (financial_charts)	34s
Build Examples (images)	53s
Build Examples (kaleido)	1m 22s
Build Examples (customization/multiple_plots_example)	33s
Build Examples (statistical_charts)	36s
Tests (ubuntu-latest, firefox, plotly_ndarray,plotly_image,static_export_geckodriver,static_expor...	3m 18s
Build Examples (subplots)	31s
Build Examples (shapes)	35s
Build Examples (themes)	36s
Build Examples (maps)	45s
Build Examples (ndarray)	35s
Build Examples (scientific_charts)	32s
Build Examples (3d_charts)	36s
Build Examples (customization/consistent_static_format_export)	1m 40s
Build Examples (custom_controls)	35s
	40m 41s

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