Added option to set preferred request body content-type

Author: thim81

lib/options.js

@@ -392,7 +392,7 @@ module.exports = {
         id: 'preferredRequestBodyType',
         type: 'enum',
         default: 'x-www-form-urlencoded',
-        availableOptions: ['x-www-form-urlencoded', 'form-data', 'Raw'],
+        availableOptions: ['x-www-form-urlencoded', 'form-data', 'raw'],
         description: 'When there are multiple content-types defined in the request body of OpenAPI, select the ' +
           'preferred option content-type as request body.',
         external: true,

test/system/structure.test.js

@@ -237,7 +237,7 @@ const optionIds = [
       name: 'Select request body type',
       type: 'enum',
       default: 'x-www-form-urlencoded',
-      availableOptions: ['x-www-form-urlencoded', 'form-data', 'Raw'],
+      availableOptions: ['x-www-form-urlencoded', 'form-data', 'raw'],
       description: 'When there are multiple content-types defined in the request body of OpenAPI, select the ' +
         'preferred option content-type as request body.',
       external: true,