Replace tango icon with modern symbol for history link (#666)

Co-authored-by: Valentin Delaye <[email protected]>

Author: jonesbusy

src/main/resources/hudson/tasks/test/TestObject/sidepanel.jelly

@@ -33,7 +33,7 @@ THE SOFTWARE.
       <j:set var="buildUrl" value="${h.decompose(request)}" />
       <j:set var="baseUrl" value="${request.findAncestor(it).relativePath}"/>
       <st:include it="${it.run}" page="tasks.jelly" optional="true"/>
-      <l:task href="${baseUrl}/history" icon="icon-graph icon-md" title="${%History}"/>
+      <l:task href="${baseUrl}/history" icon="symbol-bar-chart-outline plugin-ionicons-api" title="${%History}"/>
       <st:include it="${it.run}" page="actions.jelly" optional="true" />
 
       <t:actions actions="${it.testActions}" />