Fix(chore): fix transifex slug

Author: stonebuzz

.tx/config

@@ -1,8 +1,8 @@
 [main]
 host = https://www.transifex.com
 
-[o:teclib:p:glpi-project-plugin-pdf:r:pdf-pot]
+[o:teclib:p:glpi-project-plugin-pdf:r:pdfpot]
 file_filter = locales/<lang>.po
 source_file = locales/pdf.pot
 source_lang = en
-type        = PO
+type        = PO