Change: Revert #83 (#84)

## What
Revert #83, which added connection options in a hardcoded way.
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  Describe what changes are being made, e.g. which feature/bug is being
  developed/fixed in this PR? How did you verify the changes in this PR?
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## Why
With greenbone/openvas-scanner#1355 this options can be added when
calling wmic or wmi via the library, and currently defaults to [sign].
This hardcoded options collide with the default or provided one.

For testing:
```
wmic -d 7 -U domain/user%pass //192.168.0.1[sign,seal] "SELECT name FROM Win32_ComputerSystem"
```
or 
```
``
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## References

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## Checklist

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- [ ] Tests

samba/lib/com/dcom/main.c

@@ -511,7 +511,7 @@ static struct composite_context *dcom_determine_rpc_binding(
     if (!NT_STATUS_IS_OK(status))
     {
         /* build a binding string using NCACN_IP_TCP */
-        char *bindstr = talloc_asprintf(c, "ncacn_ip_tcp:%s[sign,seal]", server);
+        char *bindstr = talloc_asprintf(c, "ncacn_ip_tcp:%s", server);
         if (composite_nomem(bindstr, c)) return c;
 
         status = dcerpc_parse_binding(c, bindstr, &activation_state->binding);