provide max-height for the extended navbar

Author: SisIvanova

projects/igniteui-angular/src/lib/core/styles/components/navbar/_navbar-theme.scss

@@ -104,6 +104,7 @@
         justify-content: space-between;
         width: 100%;
         min-height: 56px;
+        max-height: 128px;
         padding: $navbar-padding;
         background: --var($theme, 'background');
         color: --var($theme, 'text-color');