[theme demo] Fix dropdown losing choice on solarized light / dark #7122
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Mild bug in demo due to space handling.
Before: https://codemirror.net/5/demo/theme.html#solarized%20dark
solarized%20dark
=> dropdown reset to blank..cm-s-solarized .cm-s-dark
classes),sets URL fragment to
#solarized%20dark
(implicitly encoded by browser?¹),which again triggers dropdown reset to blank (1).
After: https://raw.githack.com/cben/CodeMirror5/theme-demo-location-hash-DEBUG/demo/theme.html#solarized%20dark (from debug branch with extra console logging)
¹ ² This commit makes both setting and getting URL fragment reliable.