feat: Only allow selection of either Keine, Unbekannt, or various infections

Webservice/structured-order/src/app/components/typeahead/typeahead.component.ts

@@ -70,7 +70,14 @@ export class TypeaheadComponent implements OnInit {
     const { checked, value } = ev.detail;
 
     if (checked) {
-      this.workingSelectedValues = [...this.workingSelectedValues, value];
+      if (value == "Keine" || value == "Unbekannt") {
+        this.workingSelectedValues = [value];
+        this.confirmChanges();
+      }else { 
+        // Disable Keine or Unbekannt if something else is selected
+        this.workingSelectedValues = this.workingSelectedValues.filter((item) => item !== "Keine" && item !== "Unbekannt");
+        this.workingSelectedValues = [...this.workingSelectedValues, value];
+      }
     } else {
       this.workingSelectedValues = this.workingSelectedValues.filter((item) => item !== value);
     }