Curl generation query params bug (Fixes #810)

packages/insomnia-httpsnippet/test/fixtures/output/java/okhttp/text-plain.java

@@ -0,0 +1,11 @@
+OkHttpClient client = new OkHttpClient();
+
+MediaType mediaType = MediaType.parse("text/plain");
+RequestBody body = RequestBody.create(mediaType, "Hello World");
+Request request = new Request.Builder()
+  .url("http://mockbin.com/har")
+  .post(body)
+  .addHeader("content-type", "text/plain")
+  .build();
+
+Response response = client.newCall(request).execute();