🚸(frontend) remove the “none” effect button

While this makes it slightly less explicit that clicking an already selected
option will disable the active effect, it improves accessibility by avoiding
automatic focus movement from the previously active option to a separate “none”
option. That focus shift could be misleading or hard to follow
for screen reader users.

Open to feedback on this decision.

src/frontend/src/features/rooms/livekit/components/effects/EffectsConfiguration.tsx

@@ -15,7 +15,6 @@ import { BlurOnStrong } from '@/components/icons/BlurOnStrong'
 import { useTrackToggle } from '@livekit/components-react'
 import { Loader } from '@/primitives/Loader'
 import { useSyncAfterDelay } from '@/hooks/useSyncAfterDelay'
-import { RiProhibited2Line } from '@remixicon/react'
 import { FunnyEffects } from './FunnyEffects'
 import { useHasFunnyEffectsAccess } from '../../hooks/useHasFunnyEffectsAccess'
 
@@ -275,17 +274,6 @@ export const EffectsConfiguration = ({
                   gap: '1.25rem',
                 })}
               >
-                <ToggleButton
-                  variant="bigSquare"
-                  aria-label={t('clear')}
-                  onPress={async () => {
-                    await clearEffect()
-                  }}
-                  isSelected={!getProcessor()}
-                  isDisabled={processorPendingReveal || isDisabled}
-                >
-                  <RiProhibited2Line />
-                </ToggleButton>
                 <ToggleButton
                   variant="bigSquare"
                   aria-label={tooltipLabel(ProcessorType.BLUR, {