🚨(frontend) fix eslint errors

Recent dependencies' updates triggered new
eslint errors. Fixed them.

src/frontend/src/features/rooms/livekit/api/lowerHandParticipants.ts

@@ -11,6 +11,7 @@ export const useLowerHandParticipants = () => {
       )
       return Promise.all(promises)
     } catch (error) {
+      console.error('An error occurred while lowering hands :', error)
       throw new Error('An error occurred while lowering hands.')
     }
   }

src/frontend/src/primitives/Checkbox.tsx

@@ -134,10 +134,11 @@ export const Checkbox = ({
       >
         <StyledCheckbox {...props}>
           {(renderProps) => {
-            renderProps.isInvalid && !!props.validate
+            if (renderProps.isInvalid && !!props.validate) {
-              ? setError(props.validate(renderProps.isSelected))
+              setError(props.validate(renderProps.isSelected))
-              : setError(null)
+            } else {
-
+              setError(null)
+            }
             return (
               <>
                 <div className="mt-Checkbox-checkbox">