CLDR-18236 revert tools/cldr-code/src/test/resources/org/unicode/cldr/unittest/data/common/dtd/ldml.dtd (#5035)

Author: robertbastian

tools/cldr-code/src/test/resources/org/unicode/cldr/unittest/data/common/dtd/ldml.dtd

@@ -1720,7 +1720,7 @@ CLDR data files are interpreted according to the LDML specification (http://unic
 <!ATTLIST relativePeriod draft (approved | contributed | provisional | unconfirmed) #IMPLIED >
     <!--@METADATA-->
 
-<!ELEMENT timeZoneNames ( alias | ( hourFormat*, hoursFormat*, gmtFormat*, gmtZeroFormat*, gmtUnknownFormat*, regionFormat*, fallbackFormat*, fallbackRegionFormat*, abbreviationFallback*, preferenceOrdering*, singleCountries*, default*, zone*, metazone*, special* ) ) >
+<!ELEMENT timeZoneNames ( alias | ( hourFormat*, hoursFormat*, gmtFormat*, gmtZeroFormat*, regionFormat*, fallbackFormat*, fallbackRegionFormat*, abbreviationFallback*, preferenceOrdering*, singleCountries*, default*, zone*, metazone*, special* ) ) >
 <!ATTLIST timeZoneNames draft (approved | contributed | provisional | unconfirmed | true | false) #IMPLIED >
     <!--@METADATA-->
     <!--@DEPRECATED-->