Format string should use %n rather than \n

%n should be used in place of \n to produce the platform-specific line separator

Change-Id: I718fdf33785ea0e78b091e01f02988bd394a9a26
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/MainNavResource.java b/web/gui/src/main/java/org/onosproject/ui/impl/MainNavResource.java
index 7f0af3a..1556695 100644
--- a/web/gui/src/main/java/org/onosproject/ui/impl/MainNavResource.java
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/MainNavResource.java
@@ -50,9 +50,9 @@
             "<!-- {INJECTED-VIEW-NAV-END} -->";
 
     private static final String HDR_FORMAT =
-            "<div class=\"nav-hdr\">%s</div>\n";
+            "<div class=\"nav-hdr\">%s</div>%n";
     private static final String NAV_FORMAT =
-            "<a ng-click=\"navCtrl.hideNav()\" href=\"#/%s\">%s %s</a>\n";
+            "<a ng-click=\"navCtrl.hideNav()\" href=\"#/%s\">%s %s</a>%n";
 
     private static final String BLANK_GLYPH = "unknown";