fix: Remove extraneous whitespace in template for binary attributes (#24520)

I assume Home Assistant strips the whitespace at some point before
comparing it to payload_on/payload_off, but I haven't quite found where yet.
I have confirmed Python preserves the whitespace when simply evaluating
the Jinja.

For openHAB, it does not strip the whitespace, causing errors because
it doesn't match the payload_on or payload_off values. At some point I'd
like to bring openHAB inline with Home Assistant, but I need to do so
carefully without breaking something unexpectedly (especially with non-
Home Assistant MQTT integrations). In the meantime, this should fix the
issue in openHAB, without causing issues for Home Assistant or any other
software that follows Home Assistant's MQTT discovery process.

lib/extension/homeassistant.ts

@@ -1010,7 +1010,7 @@ export default class HomeAssistant extends Extension {
                             name: endpoint ? `${firstExpose.label} ${endpoint}` : firstExpose.label,
                             value_template:
                                 typeof firstExpose.value_on === 'boolean'
-                                    ? `{% if value_json.${firstExpose.property} %} true {% else %} false {% endif %}`
+                                    ? `{% if value_json.${firstExpose.property} %}true{% else %}false{% endif %}`
                                     : `{{ value_json.${firstExpose.property} }}`,
                             payload_on: firstExpose.value_on.toString(),
                             payload_off: firstExpose.value_off.toString(),