fix config key and device edit initial value

src/components/knx-configure-switch.ts

@@ -46,8 +46,8 @@ export class KNXConfigureSwitch extends LitElement {
       label: `${groupAddress.address} - ${groupAddress.name}`,
     }));
     logger.debug("config", this.config);
-    const device = this.config.device
-      ? deviceFromIdentifier(this.hass, this.config.device)
+    const device = this.config.device_id
+      ? deviceFromIdentifier(this.hass, this.config.device_id)
       : undefined;
     const deviceName = device ? device.name_by_user ?? device.name : "";
 
@@ -122,8 +122,8 @@ export class KNXConfigureSwitch extends LitElement {
           <div slot="description">A device allows to group multiple entities.</div>
           <knx-device-picker
             .hass=${this.hass}
-            .key=${"device"}
-            .value=${this.config.device}
+            .key=${"device_id"}
+            .value=${this.config.device_id}
             @value-changed=${this._updateConfig}
           ></knx-device-picker>
         </ha-settings-row>
@@ -133,7 +133,7 @@ export class KNXConfigureSwitch extends LitElement {
           <ha-selector
             .hass=${this.hass}
             .label=${"Name"}
-            .required=${!this.config.device}
+            .required=${!this.config.device_id}
             .selector=${{
               text: { type: "text", prefix: deviceName },
             }}

src/components/knx-device-picker.ts

@@ -59,7 +59,7 @@ class KnxDevicePicker extends LitElement {
   @state() private _showCreateDeviceDialog = false;
 
   // value is the knx identifier, not the device id
-  @state() private _deviceId?: string;
+  private _deviceId?: string;
 
   private _suggestion?: string;
 
@@ -120,6 +120,11 @@ class KnxDevicePicker extends LitElement {
     if ((!this._init && this.hass) || (this._init && changedProps.has("_opened") && this._opened)) {
       this._init = true;
       const devices = this._getDevices(knxDevices(this.hass), this.hass.areas);
+      const deviceId = this.value
+        ? devices.find((d) => d.identifier === this.value)?.id
+        : undefined;
+      this.comboBox.value = deviceId;
+      this._deviceId = deviceId;
       this.comboBox.items = devices;
       this.comboBox.filteredItems = devices;
     }