Disable separators

app/src/main/java/eu/faircode/email/DrawerAdapter.java

@@ -78,6 +78,6 @@ public class DrawerAdapter extends ArrayAdapter<DrawerItem> {
     @Override
     public boolean isEnabled(int position) {
         DrawerItem item = getItem(position);
-        return (item != null && item.getId() != 0);
+        return (item != null && item.isEnabled());
     }
 }

app/src/main/java/eu/faircode/email/DrawerItem.java

@@ -51,6 +51,10 @@ public class DrawerItem {
         return this.id;
     }
 
+    boolean isEnabled() {
+        return (this.layout != R.layout.item_drawer_separator);
+    }
+
     int getMenuId() {
         return this.menu;
     }