pidgin/pidgin

Add underscore in Meson sources lists.

2020-12-29, Elliott Sales de Andrade
16127907763b
Add underscore in Meson sources lists.

Except for zephyr, which will be done in /r/302.

Testing Done:
Compile only.

Reviewed at https://reviews.imfreedom.org/r/312/
[main]
host = https://www.transifex.com
[pidgin.pidgin_pot-for-development-branch]
file_filter = po/<lang>.po
source_file = po/pidgin.pot
source_lang = en