revert(pr47): restore AUTO_DETECT_BACKENDS=ON default

Container-side openblas linker issue will be fixed separately; do not
regress the master-level default in this PR.

Author: zhangyue

pyproject.toml

@@ -14,7 +14,7 @@ install-dir = "infini"
 
 [tool.scikit-build.cmake.define]
 AUTO_DETECT_DEVICES = "ON"
-AUTO_DETECT_BACKENDS = "OFF"
+AUTO_DETECT_BACKENDS = "ON"
 GENERATE_PYTHON_BINDINGS = "ON"
 
 [tool.pytest.ini_options]