Remove primary=true

Author: sffc

common/supplemental/supplementalData.xml

@@ -4536,7 +4536,7 @@ XXX Code for transations where no currency is involved
            <calendarSystem type="solar" />
            <eras>
                <era type="0" end="0-12-31" code="bce" aliases="bc"/> <!-- Before Common Era, Before Christ -->
-               <era type="1" start="1-01-01" code="ce" aliases="ad" primary="true"/> <!-- Common Era, Anno Domini -->
+               <era type="1" start="1-01-01" code="ce" aliases="ad"/> <!-- Common Era, Anno Domini -->
            </eras>
         </calendar>
         <calendar type="generic"/>
@@ -4836,7 +4836,7 @@ XXX Code for transations where no currency is involved
           <calendarSystem type="other"/>
           <eras>
               <era type="0" end="284-08-28" code="bd"/> <!-- Before Diocletian. NOTE: No evidence this era is used -->
-              <era type="1" start="284-08-29" code="am" primary="true"/> <!-- Anno Martyrum -->
+              <era type="1" start="284-08-29" code="am"/> <!-- Anno Martyrum -->
           </eras>
         </calendar>
         <calendar type="persian">
@@ -4855,7 +4855,7 @@ XXX Code for transations where no currency is involved
           <calendarSystem type="other"/>
           <eras>
               <era type="0" end="8-08-28" code="aa" aliases="mundi"/> <!-- Amete Alem -->
-              <era type="1" start="8-08-29" code="am" aliases="incar" primary="true"/> <!-- Amete Mihret -->
+              <era type="1" start="8-08-29" code="am" aliases="incar"/> <!-- Amete Mihret -->
           </eras>
         </calendar>
         <calendar type="ethiopic-amete-alem">
@@ -4871,7 +4871,7 @@ XXX Code for transations where no currency is involved
         <calendar type="roc">
           <eras>
               <era type="0" end="1911-12-31" code="broc" aliases="minguo-qian before-roc"/>
-              <era type="1" start="1912-01-01" code="roc" aliases="minguo" primary="true"/>
+              <era type="1" start="1912-01-01" code="roc" aliases="minguo"/>
           </eras>
         </calendar>