Fix for themes not applying (#1873)

# Fixed:
- Fixed: Fixed an issue where themes would not apply properly.

UI/Web/src/app/_models/preferences/site-theme.ts

@@ -12,6 +12,7 @@
   export interface SiteTheme {
     id: number;
     name: string;
+    normalizedName: string;
     filePath: string;
     isDefault: boolean;
     provider: ThemeProvider;