support public asset path name instead of www for capacitor engine

[RonnieRen]

if building an ionic 6 app(angular) with capacitor instead of cordova, the www folder name is changed to public, so we have to update the folder name of how to get the certificates.

[silkimen]

Hi @RonnieRen, thank you for your PR! Is there a possibility to check whether we are running on capacitor and only in this case use the public folder instead of www?

[RonnieRen]

@silkimen update the code to use different asset dir based on different bridge platform (capacitor vs cordova)