fixed issue where it automatically scroll to top when custom emoji are loaded (#29608)

webapp/channels/src/components/emoji_picker/emoji_picker.tsx

@@ -122,7 +122,10 @@ const EmojiPicker = ({
 
         const [updatedCategoryOrEmojisRows, updatedEmojiPositions] = createCategoryAndEmojiRows(allEmojis, categories, filter, userSkinTone);
 
-        selectFirstEmoji(updatedEmojiPositions);
+        if (activeCategory !== 'custom') {
+            selectFirstEmoji(updatedEmojiPositions);
+        }
+
         setCategoryOrEmojisRows(updatedCategoryOrEmojisRows);
         setEmojiPositionsArray(updatedEmojiPositions);
         throttledSearchCustomEmoji.current(filter, customEmojisEnabled);