Fix Unused Variable Warning in test_rotation_and_scale_invariance.cpp #3864
### Description:
This PR resolves a warning caused by an unused variable `IMAGE_BIKES` in the file `test_rotation_and_scale_invariance.cpp` within the `xfeatures2d` module of the OpenCV contrib repository.
- **Issue:** The variable `IMAGE_BIKES` was declared but not used in the test file, leading to a compiler warning (`-Wunused-const-variable`).
```
warning: unused variable 'IMAGE_BIKES' [-Wunused-const-variable]
static const char* const IMAGE_BIKES = "detectors_descriptors_evaluation/
```
### 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
- [ ] 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
Add BAD descriptor to xfeatures2d module
* Adding new BAD descriptor to xfeatures2d module
* Changing BAD name by TEBLID and using int threshold again for BEBLID
* Changing link to AKAZE tutorial and moved parameters initialization to ::create()
* Adding f suffixes to floating-point parameters and using arrays again
* Added BEBLID local feature descriptor
* Solved format problems, moved descriptor data to .hpp files and added BeblidSize enum
* Deleting guards from BEBLID parameter files
* Using int for the BeblidSize, using at<> to access matrix and releasing descriptors when no keypoints are detected.
