fix: amplitude initialization in preset manager

This adds the option to post to the EU endpoint and set other amplitude options.

src/preset/manager.ts

@@ -3,13 +3,21 @@ import { addons } from "@storybook/addons";
 import { STORY_CHANGED, STORY_ARGS_UPDATED } from "@storybook/core-events";
 import { parsePath } from "../parsePath";
 
-import * as amplitude from "@amplitude/analytics-browser"
+import * as amplitude from "@amplitude/analytics-browser";
 
 addons.register("storybook/amplitude", (api) => {
   if (process.env.NODE_ENV === "production") {
-    amplitude.init(globalWindow.AMPLITUDE_PROD_API_KEY);
+    amplitude.init(
+      globalWindow.AMPLITUDE_PROD_API_KEY,
+      null,
+      globalWindow.AMPLITUDE_OPTIONS
+    );
   } else {
-    amplitude.init(globalWindow.AMPLITUDE_DEV_API_KEY);
+    amplitude.init(
+      globalWindow.AMPLITUDE_DEV_API_KEY,
+      null,
+      globalWindow.AMPLITUDE_OPTIONS
+    );
   }
 
   api.on(STORY_CHANGED, () => {