Resolve custom-event-name-casing lint warnings

Signed-off-by: Sukanya Pandey <sukapan1@in.ibm.com>
Change-Id: I9eea4eac3b8cacc216fc9ad1011e51622622e75f
diff --git a/src/components/AppHeader/AppHeader.vue b/src/components/AppHeader/AppHeader.vue
index 01ebf5a..68de7d9 100644
--- a/src/components/AppHeader/AppHeader.vue
+++ b/src/components/AppHeader/AppHeader.vue
@@ -177,7 +177,7 @@
   },
   mounted() {
     this.$root.$on(
-      'change:isNavigationOpen',
+      'change-is-navigation-open',
       (isNavigationOpen) => (this.isNavigationOpen = isNavigationOpen)
     );
   },
@@ -195,7 +195,7 @@
       this.$store.dispatch('authentication/logout');
     },
     toggleNavigation() {
-      this.$root.$emit('toggle:navigation');
+      this.$root.$emit('toggle-navigation');
     },
   },
 };