Enable permission checks for zipfuse filesystems

Now that zipfuse returns correct access mode for its dirs and files,
turn on the kernel-side permission check.

Also removed a check for the .so file in the apk because the file is no
longer accessible from the test.

Bug: 264668376
Test: run microdroid tests
Change-Id: Ib321e2a2b84af2cf3766ebbbee40bd7340c9f6d7
diff --git a/zipfuse/src/main.rs b/zipfuse/src/main.rs
index 9411759..fd7e414 100644
--- a/zipfuse/src/main.rs
+++ b/zipfuse/src/main.rs
@@ -87,6 +87,7 @@
 
     let mut mount_options = vec![
         MountOption::FD(dev_fuse.as_raw_fd()),
+        MountOption::DefaultPermissions,
         MountOption::RootMode(libc::S_IFDIR | libc::S_IXUSR | libc::S_IXGRP | libc::S_IXOTH),
         MountOption::AllowOther,
         MountOption::UserId(0),