emoji_reaction test: Do a store.setServerEmojiData earlier

The message action sheet is about to condition the appearance of the
reactions row on whether we have ServerEmojiData for any of the
popular emoji. This test-setup code taps "more" on that row to
launch the emoji picker, so the data must be present by the time the
action sheet opens.

Author: chrisbobbe

test/widgets/emoji_reaction_test.dart

@@ -332,17 +332,18 @@ void main() {
       await tester.pumpWidget(TestZulipApp(accountId: eg.selfAccount.id,
         child: MessageListPage(initNarrow: narrow)));
 
+      store.setServerEmojiData(eg.serverEmojiDataPopularPlus(
+        ServerEmojiData(codeToNames: {
+          '1f4a4': ['zzz', 'sleepy'], // (just 'zzz' in real data)
+        })));
+
       // global store, per-account store, and message list get loaded
       await tester.pumpAndSettle();
       // request the message action sheet
       await tester.longPress(find.byType(MessageContent));
       // sheet appears onscreen; default duration of bottom-sheet enter animation
       await tester.pump(const Duration(milliseconds: 250));
 
-      store.setServerEmojiData(eg.serverEmojiDataPopularPlus(
-        ServerEmojiData(codeToNames: {
-          '1f4a4': ['zzz', 'sleepy'], // (just 'zzz' in real data)
-        })));
       await store.handleEvent(RealmEmojiUpdateEvent(id: 1, realmEmoji: {
         '1': eg.realmEmojiItem(emojiCode: '1', emojiName: 'buzzing'),
       }));