ui [nfc]: Pull out some helpers for showErrorAlert

We'd like to use these for a new function, showConfirmationDialog,
coming up.

Author: chrisbobbe

src/utils/info.js

@@ -9,28 +9,33 @@ export const showToast = (message: string) => {
   Toast.show(message);
 };
 
+type LearnMoreButton = {|
+  url: URL,
+  text?: string,
+
+  // Needed by openLinkWithUserPreference
+  globalSettings: GlobalSettingsState,
+|};
+
+const makeLearnMoreButton = learnMoreButton => {
+  const { url, text, globalSettings } = learnMoreButton;
+  return {
+    // TODO: Translate default text
+    text: text ?? 'Learn more',
+    onPress: () => {
+      openLinkWithUserPreference(url.toString(), globalSettings);
+    },
+  };
+};
+
 export const showErrorAlert = (
   title: string,
   message?: string,
-
-  learnMoreButton?: {|
-    url: URL,
-    text?: string,
-
-    // Needed by openLinkWithUserPreference
-    globalSettings: GlobalSettingsState,
-  |},
+  learnMoreButton?: LearnMoreButton,
 ): void => {
   const buttons = [];
   if (learnMoreButton) {
-    const { url, text, globalSettings } = learnMoreButton;
-    buttons.push({
-      // TODO: Translate default text
-      text: text ?? 'Learn more',
-      onPress: () => {
-        openLinkWithUserPreference(url.toString(), globalSettings);
-      },
-    });
+    buttons.push(makeLearnMoreButton(learnMoreButton));
   }
   buttons.push({ text: 'OK', onPress: () => {} });