[BUG] [JavaSpring] Using deepObject with additional properties not possible for server mode

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

In case of using JavaSpring generator start from 4.3.0 using deepObject and additional parameters in query properties not possible.
Actually in version 4.2.0 was result
default ResponseEntity<Void> getRequests(@RequestParam(value = "sortDir", required = false) String sortDir, @RequestParam(value = "meta", required = false) Map<String, Object> meta) ;

in version 4.3.0 got result
default ResponseEntity<Void> getRequests(@RequestParam(value = "sortDir", required = false) String sortDir, @RequestParam(value = "", required = false) Map<String, Object> meta) ;

In next version value for request param in case of Map deleted. It is mean all parameter will put in map.

Changes witch create this problems in file queryParams.mustache
queryParams.mustache v4.2.3
queryParams.mustache v4.3.0

openapi-generator version

        openapi: 3.0.3
        info:
          version: 1.0.0
          title: Test Resource
          description: Diese TEST API
        servers:
          - url: /
        paths:
          "/requests":
            get:
              tags:
              - Request
              description: Get requests
              summary: Get requests
              operationId: getRequests
              parameters:
                - name: sortDir
                  in: query
                  description: sorting directing, one of asc or desc
                  schema:
                    type: string
                    enum: 
                      - asc
                      - desc
                - name: meta
                  in: query
                  style: deepObject
                  description: Parameters for querying process lgos based on their metadata. ?meta[myKey]=myValue&meta[myKey2]=myValue2
                  schema:
                    type: object
                    additionalProperties: true
                    example:
                      myKey: myValue
                      myKey2: 242839744
              responses:
                "200":
                  description: OK

Generation Details

spring delegate pattern

Steps to reproduce

Related issues/PRs

Suggest a fix

Start with modules/openapi-generator/src/main/resources/JavaSpring/queryParams.mustache and compare the v4.2.3 and v4.3.0 versions linked in the issue. Generate the provided OpenAPI 3.0.3 example using the Spring delegate pattern, then verify that the deepObject map parameter retains its request-parameter name while sortDir remains unchanged.