Fix: _WD_CapabilitiesAdd wiping vendor object on empty primitive value

[Danp2]

Pull request

Proposed changes

In the SPECIFICVENDOR_PRIMITIVE branch, the capability key name was only appended to the JSON notation when $value1 was non-empty. Since $value1 defaults to '' when the caller omits it, a call like _WD_CapabilitiesAdd('detach') left $s_Notation pointing at the whole vendor-options object (e.g. "ms:edgeOptions"), and the subsequent Json_Put() replaced that entire object with '', destroying any previously-added sibling capabilities (args, prefs, etc).

Always append the key, matching the unconditional behavior already used by the neighboring SPECIFICVENDOR_ARRAY/SPECIFICVENDOR_OBJECT branches.

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