Fix theme switcher

[benjeffery]

Fixes #187

[github-actions]

Automated Screenshots

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edges.png

mutations-popup.png

mutations.png

nodes.png

out_edges.png

out_mutations.png

out_nodes.png

overview.png

tables.png

trees.png

[coveralls]

Pull Request Test Coverage Report for Build 11406798224

Details

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 90.288%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
tsbrowse/main.py	0	1	0.0%

Totals
Change from base Build 11364110244:	0.0%
Covered Lines:	753
Relevant Lines:	834

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💛 - Coveralls

[jeromekelleher]

Oof, well done on figuring that one out!