Fix IconButton indent regression

Yesterday I merged a fix to the IconButton component which adds a `text-indent` for when the component has text. This works because the SVG inside is not affected by text-indent.

But the quick-shortcuts in the block appender wrap this icon with a `span`, which _is_ affected by the text-indent.

I can look for other solutions that do not rely on text-indent, but simply removing this span entirely seems to have no negative effects. Why was it added? No CSS appears to target the element.

editor/components/inserter-with-shortcuts/index.js

@@ -43,9 +43,7 @@ function InserterWithShortcuts( { items, isLocked, onToggle, onInsert } ) {
 					onClick={ () => onInsert( item ) }
 					label={ sprintf( __( 'Add %s' ), item.title ) }
 					icon={ (
-						<span className="editor-inserter-with-shortcuts__block-icon">
-							<BlockIcon icon={ item.icon } />
-						</span>
+						<BlockIcon icon={ item.icon } />
 					) }
 				/>
 			) ) }