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lua: fix box.error usage in loaders

The Lua module loader users box.error to raise an error if it fails to
load a module. The problem is that the box module is undefined at
startup when we load built-in modules so it falls back to the plain
error. However, the check of box presence might trigger the strict
checker failure, which would hide the original error:

```
builtin/internal.loaders.lua:241: variable 'box' is not declared
__index (metamethod), builtin/strict.lua:32
```

Let's fix this by using rawget for checking if box is defined.

Fixes commit 4175ab0545405 ("error: set trace of caller for API in Lua
for several modules").

Needed to investigate #12363

NO_DOC=bug fix
NO_CHANGELOG=this is a minor issue, which can happen only if the user
             overrides a built-in module and fails

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