fix: correctly convert JWP capabilities to W3C

The `processConfig()` function attempts to convert capabilities from the
deprecated JWP format to the new standard W3C one.

Fix the logic for detecting when capabilites are in JWP format.
(Previously, the logic was inverted.)

Also, make sure that the `sauce:options` property is correctly populated
in both cases.

src/process-config.ts

@@ -57,17 +57,17 @@ export function processConfig(config: any = {}, args: any = {}) {
   };
 
   // transform JWP capabilities into W3C capabilities for backward compatibility
-  if (isW3C(args)) {
+  if (!isW3C(args)) {
     args.browserVersion = args.browserVersion || args.version || 'latest'
     args.platformName = args.platformName || args.platform || 'Windows 10'
-    args['sauce:options'] = {...capabilitiesFromConfig, ...(args['sauce:options'] || {})}
 
     // delete JWP capabilities
     delete args.version
     delete args.platform
-  } else {
-    args = {...args, ...capabilitiesFromConfig}
   }
+
+  args['sauce:options'] = {...capabilitiesFromConfig, ...(args['sauce:options'] || {})}
+
   // Not needed
   delete args.base