fixup! [Rust] Add support for shallow object query params

Author: whirm

modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache

@@ -156,7 +156,12 @@ pub {{#supportAsync}}async {{/supportAsync}}fn {{{operationId}}}(configuration:
     {{^isArray}}
     {{^isNullable}}
     {{#isModel}}
+    {{#isDeepObject}}
+      let params = crate::apis::parse_deep_object("{{{baseName}}}", &serde_json::to_value(param_value)?);
+    {{/isDeepObject}}
+    {{^isDeepObject}}
     let params = crate::apis::parse_flat_object(&serde_json::to_value({{{vendorExtensions.x-rust-param-identifier}}})?);
+    {{/isDeepObject}}
     req_builder = req_builder.query(&params);
     {{/isModel}}
     {{^isModel}}