Remove hack for Microphone, because is not behaving in the same way as other permissions

[Amejia481]

Before we show a prompt for a site permission, we get a request from PermissionDelegate.onAndroidPermissionsRequest to request all the Android permissions needed and if all are granted, we get a call on PermissionDelegate.onMediaPermissionRequest or PermissionDelegate.onContentPermissionRequest to show the prompt. If the Android permissions are deny we don't get any call to neither of the functions above. But for the microphone permission we are getting a call to this function after the android permissions was denied, causing a bad user experience.

To prevent this behavior we added a check for this. The idea is to remove it after the API is fix.

More details
https://bugzilla.mozilla.org/show_bug.cgi?id=1542627

┆Issue is synchronized with this Jira Task

[Amejia481]

Closed in favor of #6299