Fix(UI): Side panel having two scrollbars (#20456)

Fixes: #20417

Screenshot:
<img width="411" height="945" alt="image"
src="https://github.com/user-attachments/assets/925b3ac9-49f2-4fcc-920e-3b9dc34ac466"
/>

packages/twenty-front/src/modules/side-panel/components/SidePanelList.tsx

@@ -35,10 +35,6 @@ const StyledInnerList = styled.div`
   }
 `;
 
-const StyledSidePanelList = styled.div`
-  overflow-y: hidden;
-`;
-
 const StyledEmpty = styled.div`
   align-items: center;
   color: ${themeCssVariables.font.color.light};
@@ -61,7 +57,7 @@ export const SidePanelList = ({
   );
 
   return (
-    <StyledSidePanelList>
+    <>
       <SidePanelDefaultSelectionEffect selectableItemIds={selectableItemIds} />
       <ScrollWrapper componentInstanceId={`scroll-wrapper-side-panel`}>
         <StyledInnerList>
@@ -80,6 +76,6 @@ export const SidePanelList = ({
           </SelectableList>
         </StyledInnerList>
       </ScrollWrapper>
-    </StyledSidePanelList>
+    </>
   );
 };