fix(reg): Fix double path separator for lottie assets

src/Uno.UWP/Storage/Helpers/AssetsPathBuilder.wasm.cs

@@ -21,7 +21,7 @@ internal static class AssetsPathBuilder
 			=> !string.IsNullOrEmpty(UNO_BOOTSTRAP_APP_BASE)
 				// Concatenates the app's base path (used to support deep-linking), with the generated app based content folder name.
 				// See https://github.com/unoplatform/Uno.Wasm.Bootstrap#configuration-environment-variables for more details.
-				? $"{UNO_BOOTSTRAP_WEBAPP_BASE_PATH}{UNO_BOOTSTRAP_APP_BASE}/{contentRelativePath}"
+				? $"{UNO_BOOTSTRAP_WEBAPP_BASE_PATH}{UNO_BOOTSTRAP_APP_BASE}/{contentRelativePath?.TrimStart('/')}"
 				: contentRelativePath;
 	}
 }