use es_AR separators when using es_AR formats

Noticed due to the change in es_PE as of
bd4b06fc

See also
https://ssl.icu-project.org/icu-bin/locexp?d_=en&_=es_AR
https://ssl.icu-project.org/icu-bin/locexp?d_=en&_=es_PY

Change-Id: I60e35a14a515a4e6e0d91aacf2a3540f31928415

i18npool/source/localedata/data/es_PY.xml

@@ -31,7 +31,7 @@
       <PlatformID>generic</PlatformID>
     </Platform>
   </LC_INFO>
-  <LC_CTYPE ref="es_PE"/>
+  <LC_CTYPE ref="es_AR"/>
   <LC_FORMAT ref="es_AR" replaceTo="[$G-3C0A]"/>
   <LC_COLLATION ref="en_US"/>
   <LC_SEARCH ref="en_US"/>