Set the landing and login pages background refresh to 15 seconds rather than 10 and 7

src/Ombi/ClientApp/app/landingpage/landingpage.component.ts

@@ -37,7 +37,7 @@ export class LandingPageComponent implements OnDestroy, OnInit {
         });
         this.timer = setInterval(() => {
             this.cycleBackground();
-        }, 10000);
+        }, 15000);
 
         const base = this.location.getBaseHrefFromDOM();
         if (base.length > 1) {

src/Ombi/ClientApp/app/login/login.component.ts

@@ -87,7 +87,7 @@ export class LoginComponent implements OnDestroy, OnInit {
         });
         this.timer = setInterval(() => {
             this.cycleBackground();
-        }, 7000);
+        }, 15000);
 
         const base = this.location.getBaseHrefFromDOM();
         if (base.length > 1) {