fix: Avoid duplicate slash in AssetsPathBuilder

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

@@ -23,7 +23,7 @@ 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?.TrimStart('/')}"
+				? $"{UNO_BOOTSTRAP_WEBAPP_BASE_PATH}{UNO_BOOTSTRAP_APP_BASE.TrimEnd('/')}/{contentRelativePath?.TrimStart('/')}"
 				: contentRelativePath;
 	}
 }