fix(ui): do not constrain width of hide/show boards button

lets translations display fully

invokeai/frontend/web/src/features/gallery/components/ImageGalleryContent.tsx

@@ -60,7 +60,6 @@ const ImageGalleryContent = () => {
         <GalleryHeader />
         <Flex alignItems="center" justifyContent="space-between" w="full">
           <Button
-            w={112}
             size="sm"
             variant="ghost"
             onClick={handleToggleBoardPanel}