[tests] Migrate remote_transmitter/receiver to common bus definitions (#11325)

tests/components/ballu/common.yaml

@@ -1,7 +1,3 @@
-remote_transmitter:
-  pin: ${pin}
-  carrier_duty_percent: 50%
-
 climate:
   - platform: heatpumpir
     protocol: ballu
@@ -10,3 +6,4 @@ climate:
     name: HeatpumpIR Climate
     min_temperature: 18
     max_temperature: 30
+    transmitter_id: xmitr