add missing legacyOnly currency, fdo#84260

aa33dd16b0e3075f28c56656678c0f5cb7642222 changed the currency symbol
from ¢ to ₡ but changed only the symbol. Actually changing the number
format codes wasn't necessary at all, but changing only the symbol is
wrong, see also the ATTLIST Currency  legacyOnly description in
i18npool/source/localedata/data/locale.dtd

Hopefully nothing relies on the actual symbol used in the number format
codes ...

Change-Id: I92e79403fbb80f18c44dc3ecf5a3830a52fd2ff8