Fix: resetting validationError on update.

client/common/configuration/elements/channel-configuration.ts

@@ -61,6 +61,17 @@ export class ChannelConfigurationElement extends LivechatElement {
     this.requestUpdate()
   }
 
+  /**
+   * Resets the validation errors.
+   * @param ev the vent
+   */
+  public resetValidation (_ev?: Event): void {
+    if (this.validationError) {
+      this.validationError = undefined
+      this.requestUpdate('_validationError')
+    }
+  }
+
   /**
    * Saves the channel configuration.
    * @param event event