Add missing import.

Author: taeold

src/providers/https.ts

@@ -28,7 +28,7 @@ import {
  optionsToTrigger,
  Runnable,
 } from '../cloud-functions';
-import { convertIfPresent, convertInvoker } from '../common/encoding';
+import {convertIfPresent, convertInvoker, copyIfPresent} from '../common/encoding';
 import {
  CallableContext,
  FunctionsErrorCode,