pidgin/pidgin

Make PurpleWhiteboardManager a final type

2021-10-20, Gary Kramlich
a80230105e43
Make PurpleWhiteboardManager a final type

Testing Done:
ran the unit tests.

Reviewed at https://reviews.imfreedom.org/r/1085/
[wrap-hg]
directory = libgnt
url = https://keep.imfreedom.org/libgnt/libgnt
revision = default