[BUG] [typescript-axios] generator additional property `withInterfaces` is incompatible with `useSingleRequestParameter`

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

The interfaces generated by enabling useInterfaces in the typescript-axios generator do not respect useSingleRequestParameter so the code will not compile due to mismatching methods on the implementations.

openapi-generator version

openapi-generator-cli-5.0.0-20200625.105436-332.jar

OpenAPI declaration file content or url

Command line used for generation

openapi-generator generate \
		-i $(OPENAPI_SPEC_DOC_JSON) \
		-g typescript-axios \
		-o $(OPENAPI_SPEC_TS_DIR) \
		--additional-properties=supportsES6=true,withInterfaces=true,useSingleRequestParameter=true

Steps to reproduce

Run the generator with the above options.

Suggest a fix

I can provide an example, but it might be less effort to just fix it. A cursory glance makes it look like it just needs allParams.0 in the method signatures of the interface conditioned on the useSingleRequestParameter.

Start by running the supplied openapi-generator command with the typescript-axios generator and both withInterfaces=true and useSingleRequestParameter=true. Compare the generated interface method signatures with their implementations; done means the generated TypeScript compiles without mismatches while both options remain enabled.