main: Don't pass --seed for zig run.

[alexrp]

Looks like an accidental effect introduced in #20750.

Had me questioning reality for a bit before I realized what was going on:

❯ zig run generate_linux_syscalls.zig -- $(which zig) /home/alexrp/Source/linux
error: NotDir
/home/alexrp/Source/zig/lib/std/posix.zig:1783:24: 0x108024f in openatZ (generate_linux_syscalls)
            .NOTDIR => return error.NotDir,
                       ^
/home/alexrp/Source/zig/lib/std/fs/Dir.zig:1565:21: 0x1090736 in openDirFlagsZ (generate_linux_syscalls)
        else => |e| return e,
                    ^
/home/alexrp/Source/zig/lib/std/fs/Dir.zig:1529:5: 0x107fef2 in openDirZ (generate_linux_syscalls)
    return self.openDirFlagsZ(sub_path_c, symlink_flags);
    ^
/home/alexrp/Source/zig/lib/std/fs/Dir.zig:1473:5: 0x104cace in openDir (generate_linux_syscalls)
    return self.openDirZ(&sub_path_c, args);
    ^
/home/alexrp/Source/zig/lib/std/fs.zig:283:5: 0x10460bb in openDirAbsolute (generate_linux_syscalls)
    return cwd().openDir(absolute_path, flags);
    ^
/home/alexrp/Source/zig/tools/generate_linux_syscalls.zig:66:23: 0x103d9f3 in main (generate_linux_syscalls)
    const linux_dir = try std.fs.openDirAbsolute(linux_path, .{});

[andrewrk]

Oops, thank you!