[ld2412] Drop the unused gate index from GateThresholdNumber (#19107)

esphome/components/ld2412/number/__init__.py

@@ -109,14 +109,14 @@ async def to_code(config: ConfigType) -> None:
     for x in range(14):
         if gate_conf := config.get(f"gate_{x}"):
             move_config = gate_conf[CONF_MOVE_THRESHOLD]
-            n = cg.new_Pvariable(move_config[CONF_ID], x)
+            n = cg.new_Pvariable(move_config[CONF_ID])
             await number.register_number(
                 n, move_config, min_value=0, max_value=100, step=1
             )
             await cg.register_parented(n, config[CONF_LD2412_ID])
             cg.add(LD2412_component.set_gate_move_threshold_number(x, n))
             still_config = gate_conf[CONF_STILL_THRESHOLD]
-            n = cg.new_Pvariable(still_config[CONF_ID], x)
+            n = cg.new_Pvariable(still_config[CONF_ID])
             await number.register_number(
                 n, still_config, min_value=0, max_value=100, step=1
             )

esphome/components/ld2412/number/gate_threshold_number.cpp

@@ -2,8 +2,6 @@
 
 namespace esphome::ld2412 {
 
-GateThresholdNumber::GateThresholdNumber(uint8_t gate) : gate_(gate) {}
-
 void GateThresholdNumber::control(float value) {
   this->publish_state(value);
   this->parent_->set_gate_threshold();

esphome/components/ld2412/number/gate_threshold_number.h

@@ -7,10 +7,10 @@ namespace esphome::ld2412 {
 
 class GateThresholdNumber final : public number::Number, public Parented<LD2412Component> {
  public:
-  GateThresholdNumber(uint8_t gate);
+  // Not "= default": that makes new(p) T() zero-fill the object at every codegen site before the ctor runs.
+  GateThresholdNumber() {}
 
  protected:
-  uint8_t gate_;
   void control(float value) override;
 };