Correct LOGS path in wheel build script

A recent change assumed $LOGS was a relative path, but it starts
with $(pwd) so is absolute. Correct this broken assumption which was
causing the script to exit non-zero and fail the
publish-wheel-mirror-* jobs.

Change-Id: I837a0657aa9ae11211599b019711cba8f17ee094

roles/build-wheels/files/wheel-build.sh

@@ -70,7 +70,7 @@ find ${LOGS}/build/ -name stdout -exec grep 'Downloading from URL' {} \; \
     | sed -n 's,.*Downloading from URL .*/\([^/]*\.whl\)#.*,\1,p' \
     | sort -u > ${LOGS}/remove-wheels.txt
 pushd ${WHEELHOUSE_DIR}
-cat ../${LOGS}/remove-wheels.txt | xargs rm
+cat ${LOGS}/remove-wheels.txt | xargs rm
 popd
 
 if [ -f ${FAIL_LOG} ]; then