ui: enable controlnet controls when FLUX is main model, update schema

invokeai/frontend/web/src/features/controlLayers/components/CanvasAddEntityButtons.tsx

@@ -80,7 +80,6 @@ export const CanvasAddEntityButtons = memo(() => {
             justifyContent="flex-start"
             leftIcon={<PiPlusBold />}
             onClick={addControlLayer}
-            isDisabled={isFLUX}
           >
             {t('controlLayers.controlLayer')}
           </Button>

invokeai/frontend/web/src/features/controlLayers/components/CanvasEntityList/EntityListGlobalActionBarAddLayerMenu.tsx

@@ -56,7 +56,7 @@ export const EntityListGlobalActionBarAddLayerMenu = memo(() => {
           </MenuItem>
         </MenuGroup>
         <MenuGroup title={t('controlLayers.layer_other')}>
-          <MenuItem icon={<PiPlusBold />} onClick={addControlLayer} isDisabled={isFLUX}>
+          <MenuItem icon={<PiPlusBold />} onClick={addControlLayer}>
             {t('controlLayers.controlLayer')}
           </MenuItem>
           <MenuItem icon={<PiPlusBold />} onClick={addRasterLayer}>