Remove obsolete conlang tokipona from wikisource

Added in 2007.
https://mediawiki.org/wiki/Special:Code/pywikipedia/3487

It never existed.
https://meta.wikimedia.org/w/index.php?oldid=2248822

Change-Id: I9166883393b1a776f6e5abb35f5d3290c73a1844
Merge "Remove obsolete conlang tokipona from wikisource"