fix(klarstein_skytowergrandsmart_fan): hide binary sensors

The two binary sensors do not seem to convey useful info, so hide them
by default.
- Ionizer seems to be always on on this model, so follows the
power switch according to the manual.
- Purifier is not mentioned in the manual for this model, and may
be a misunderstanding of what directly translates to "Air Defender",
or intended to signal feature support for common WiFi firmware across
other models.

Issue #3364

custom_components/tuya_local/devices/klarstein_skytowergrandsmart_fan.yaml

@@ -74,6 +74,7 @@ entities:
     class: running
     icon: "mdi:atom"
     category: diagnostic
+    hidden: true
     dps:
       - id: 101
         type: boolean
@@ -83,6 +84,7 @@ entities:
     class: running
     icon: "mdi:air-purifier"
     category: diagnostic
+    hidden: true
     dps:
       - id: 102
         type: boolean