Merge pull request #25445 from Kumataro:fix25403

apps: createsamples: fix comment to remove last backslash #25445

Close #25403

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [ ] The feature is well documented and sample code can be built with the project CMake

apps/createsamples/utility.cpp

@@ -1168,7 +1168,7 @@ void cvCreateTestSamples( const char* infoname,
             }
             else
             {
-                filename++; // character after last / or \
+                filename++; // get basename after last path delimiter
             }
 
             count = MIN( count, cvbgdata->count );