message: micro: in CONTRIBUTING.md, fix path to test script
  Fixes
diff: @@ -204,7 +204,7 @@ to determine if the requested feature aligns with the TFLM roadmap.
  1. Run all the tests for x86, and any other platform that you are modifying.
  ```
  - tensorflow/lite/micro/tools/make/tools/ci_build/test_x86.sh
  + tensorflow/lite/micro/tools/ci_build/test_x86.sh
  ```
  Please check the READMEs in the optimized kernel directories for specific
  