utils: Add inputKindCaps field to input list array

I debated adding this to the input kinds array, where this field's
value truly comes from, but the value of that return is
`Array<String>`, so we don't really have any options without bumping
the current RPC version.

I am thinking of revisiting some aspects of the obs-websocket request
objectives, and bumping the RPC version. I would like to take a more
REST-style approach to reading/modification of OBS state.

Author: tt2468

src/utils/Obs_ArrayHelper.cpp

@@ -200,6 +200,7 @@ std::vector<json> Utils::Obs::ArrayHelper::GetInputList(std::string inputKind)
 		inputJson["inputUuid"] = obs_source_get_uuid(input);
 		inputJson["inputKind"] = inputKind;
 		inputJson["unversionedInputKind"] = obs_source_get_unversioned_id(input);
+		inputJson["inputKindCaps"] = obs_source_get_output_flags(input);
 
 		inputInfo->inputs.push_back(inputJson);
 		return true;