Fixed both import types active on import dialog open

ui-ngx/src/app/shared/import-export/import-dialog.component.ts

@@ -71,7 +71,7 @@ export class ImportDialogComponent extends DialogComponent<ImportDialogComponent
     this.importFormGroup = this.fb.group({
       importType: ['file'],
       fileContent: [null, [Validators.required]],
-      jsonContent: [null, [Validators.required]]
+      jsonContent: [{ value: null, disabled: true }, [Validators.required]]
     });
     this.importFormGroup.get('importType').valueChanges.pipe(
       takeUntilDestroyed(this.destroyRef)