fix radio for theme selection

[t3chguy]

• Fixes Theme Options in User Settings Are Mildly Broken element-hq/element-web#4700 *
• Should Fix Theme changes have never had any effect.  element-hq/element-web#4964 *

Signed-off-by: Michael Telatynski [email protected]

facebook/react#8575 broke it
normally input value/checked should be dumped to state and read from there but this works instead.

onChange now doesn't fire if you don't pass the value into the checked prop anymore.

[dbkr]

Mmm, we should really make the UserSettingsStore more like a store and reload all the data from the store, but I guess this would involve changing a lot of UserSettings