Allow circle-basic in options.js - improved demo page

[alessiochiffi]

Changes

• Added 'circle-basic' to allowed options. It was missing from allowedStyle object in relation to outerStyle, resulting in an error in the console.
• The style change from the dropdown is now immediate on the demo page, without the need of clicking try now.

[dshongphuc]

Hi @alessiochiffi thank you for your fix. But the "circle-basic" is outdated (and the ones from demo page are also outdated). Can you please remove it from allow options, and also change all "circle-basic" in the demo page to "circle" instead? Thanks

[alessiochiffi]

That make sense, I removed circle-basic @dshongphuc 👍