fix condition for selfPreservationMode

spring-cloud-netflix-eureka-server/src/main/resources/templates/eureka/navbar.ftl

@@ -53,7 +53,7 @@
 </div>
 
 <#if isBelowRenewThresold>
-    <#if registry.selfPreservationModeEnabled>
+    <#if !registry.selfPreservationModeEnabled>
         <h4 id="uptime"><font size="+1" color="red"><b>RENEWALS ARE LESSER THAN THE THRESHOLD. THE SELF PRESERVATION MODE IS TURNED OFF.THIS MAY NOT PROTECT INSTANCE EXPIRY IN CASE OF NETWORK/OTHER PROBLEMS.</b></font></h4>
     <#else>
         <h4 id="uptime"><font size="+1" color="red"><b>EMERGENCY! EUREKA MAY BE INCORRECTLY CLAIMING INSTANCES ARE UP WHEN THEY'RE NOT. RENEWALS ARE LESSER THAN THRESHOLD AND HENCE THE INSTANCES ARE NOT BEING EXPIRED JUST TO BE SAFE.</b></font></h4>