Revert "Remove link to room management"

This reverts commit 2df25d1

Author: micopiira

src/main/webapp/WEB-INF/views/_header.jsp

@@ -49,6 +49,10 @@
 								   href="${spring:mvcUrl('AC#listReservations').build()}">
 									<spring:message code="allReservations"/>
 								</a>
+								<a class="dropdown-item"
+								   href="${spring:mvcUrl('RC#listRooms').build()}">
+									<spring:message code="manageRooms"/>
+								</a>
 								<div class="dropdown-divider"></div>
 							</security:authorize>
 							<form:form action="${pageContext.request.contextPath}/logout">