Error in function parseHashAsQueryParams in NbOAuth2AuthStrategy when token contains the character equals '='

Hi,
When using oauth2 strategy, I used to have token containing equals character (=), but the function that extract the token from the url params is spliting by this same character which makes the token incorrect. I propose that the function parseHashAsQueryParams uses indexOf and substring functions instead :
something like :
```
let key=part.substring(0,part.indexOf('='));
let value=part.substring(part.indexOf('=')+1);
```
if part="access_token=mPe+/DazAEXUU2D/oJO71kDLyk4="
the value of the key access_token is from first character after equals to the end = "mPe+/DazAEXUU2D/oJO71kDLyk4="