pidgin/pidgin

Fix the purplepath unit tests by setting up the test ui and fixing the paths we validate

Testing Done:
Ran the tests.

Reviewed at https://reviews.imfreedom.org/r/1827/
syntax: glob
.*.swp
.DS_Store
.flatpak-builder
*.pyc
*~
\#*\#
syntax: regexp
^build(.+)?\/
win32-install-dir(\.release)?
po\/pidgin\.pot$
^subprojects\/.+\/