Fix load more button height on account gallery page

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

app/soapbox/components/load-more.tsx

@@ -6,16 +6,17 @@ import { Button } from 'soapbox/components/ui';
 interface ILoadMore {
   onClick: React.MouseEventHandler
   disabled?: boolean
-  visible?: Boolean
+  visible?: boolean
+  className?: string
 }
 
-const LoadMore: React.FC<ILoadMore> = ({ onClick, disabled, visible = true }) => {
+const LoadMore: React.FC<ILoadMore> = ({ onClick, disabled, visible = true, className }) => {
   if (!visible) {
     return null;
   }
 
   return (
-    <Button theme='primary' block disabled={disabled || !visible} onClick={onClick}>
+    <Button className={className} theme='primary' block disabled={disabled || !visible} onClick={onClick}>
       <FormattedMessage id='status.load_more' defaultMessage='Load more' />
     </Button>
   );

app/soapbox/features/account-gallery/index.tsx

@@ -121,7 +121,7 @@ const AccountGallery = () => {
   let loadOlder = null;
 
   if (hasMore && !(isLoading && attachments.size === 0)) {
-    loadOlder = <LoadMore visible={!isLoading} onClick={handleLoadOlder} />;
+    loadOlder = <LoadMore className='my-auto' visible={!isLoading} onClick={handleLoadOlder} />;
   }
 
   if (unavailable) {