webapp: pin assignment: hide unsupported pins

if the pin_mapping.json includes unsupported pins, e.g., `eth` pins on
an ESP32-S3, the whole category should still be hidden in the device
manager.

webapp/src/components/PinInfo.vue

@@ -60,6 +60,7 @@ export default defineComponent({
             let selArray: Array<string> = [];
             if (this.selectedPinAssignment) {
                 selArray = Object.keys(this.selectedPinAssignment as Device);
+                selArray = selArray.filter((item) => curArray.includes(item));
             }
 
             let total: Array<string> = [];