recovery: Fix the crash caused by StartIteration

In the new version of libziparchive, the default values ​​of the optional_prefix and optional_suffix parameters of the StartIteration function are changed to empty strings, and nullptr is no longer detected.

Change-Id: I66ee58a9515586700b10a3d5aa5b780a6207b33c
diff --git a/twrpinstall/installcommand.cpp b/twrpinstall/installcommand.cpp
index ad7a772..d577b38 100755
--- a/twrpinstall/installcommand.cpp
+++ b/twrpinstall/installcommand.cpp
@@ -302,7 +302,7 @@
 
   // Iterate all the entries inside COMPATIBILITY_ZIP_ENTRY and read the contents.
   void* cookie;
-  ret = StartIteration(zip_handle, &cookie, nullptr, nullptr);
+  ret = StartIteration(zip_handle, &cookie);
   if (ret != 0) {
     printf("Failed to start iterating zip entries: %s\n", ErrorCodeString(ret));
     CloseArchive(zip_handle);