Fix error in shortcode when there are multiple shortcode attributes.:

[codehaiku]

No description provided.

[codehaiku]

There is an error with the shortcode.

When I try to use the following shortcode:
[bigbluebutton token=”z9214″ submit="Meet me there!"]

The result is:

The token: Meetmethere is not associated with an existing room.

Please check diff if the proposed changes is acceptable.

Thanks!