ICU: pg_dump: fix the use of the encoding value to add the database collprovider

i_encoding is the index in the tuple.

Author: Marina Polyakova

src/bin/pg_dump/pg_dump.c

@@ -2577,7 +2577,7 @@ dumpDatabase(Archive *fout)
 			dbcollate = addCollProvider(dbcollate,
 										fout->remoteVersion,
 										fout->remoteEdition,
-										i_encoding);
+										pg_char_to_encoding(encoding));
 		appendStringLiteralAH(creaQry, dbcollate, fout);
 		free(dbcollate);
 	}