meson: fix nlohmann json wrap

A bmcweb header includes adl_serializer.hpp

```
http/utility.hpp
12:#include <nlohmann/adl_serializer.hpp>
```

But the single include does not provide adl_serializer.hpp

```
tree subprojects/nlohmann_json-3.11.3/single_include/
subprojects/nlohmann_json-3.11.3/single_include/
└── nlohmann
    ├── json_fwd.hpp
    └── json.hpp

2 directories, 2 files
```

To include it, bmcweb needs to include the multiple headers.

In subprojects/nlohmann_json-3.11.3/meson.build

```
nlohmann_json_dep = declare_dependency(
    include_directories: include_directories('single_include')
)

nlohmann_json_multiple_headers = declare_dependency(
    include_directories: include_directories('include')
)
```

Change the dependency to use multiple headers to enable local builds.

Tested: bmcweb can be compiled locally, with nlohmann json as a
meson subproject.

Change-Id: I0de726cbee0f31e8439d0fb8861a25b9d83a8acb
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>
diff --git a/subprojects/nlohmann_json.wrap b/subprojects/nlohmann_json.wrap
index 8c46676..1ffc030 100644
--- a/subprojects/nlohmann_json.wrap
+++ b/subprojects/nlohmann_json.wrap
@@ -8,4 +8,4 @@
 wrapdb_version = 3.11.3-1
 
 [provide]
-nlohmann_json = nlohmann_json_dep
+nlohmann_json = nlohmann_json_multiple_headers