Run x test tidy sooner in mingw-check

It takes less time to run than the other tests and is more likely to fail.
`expand-yaml-anchors` is still run first to make sure the CI files are internally consistent.

src/ci/docker/host-x86_64/mingw-check/Dockerfile

@@ -40,10 +40,10 @@ COPY host-x86_64/mingw-check/validate-error-codes.sh /scripts/
 
 ENV RUN_CHECK_WITH_PARALLEL_QUERIES 1
 ENV SCRIPT python3 ../x.py --stage 2 test src/tools/expand-yaml-anchors && \
+           python3 ../x.py test --stage 0 src/tools/tidy && \
            python3 ../x.py check --target=i686-pc-windows-gnu --host=i686-pc-windows-gnu --all-targets && \
            python3 ../x.py build --stage 0 src/tools/build-manifest && \
            python3 ../x.py test --stage 0 src/tools/compiletest && \
-           python3 ../x.py test --stage 2 src/tools/tidy && \
            python3 ../x.py test --stage 0 core alloc std test proc_macro && \
            # Build both public and internal documentation.
            RUSTDOCFLAGS="--document-private-items" python3 ../x.py doc --stage 0 library/test && \