reenable all multiple backend tests

Author: benzekrimaha

package.json

@@ -137,7 +137,7 @@
     "test_legacy_location": "CI=true S3QUOTA=scuba S3_LOCATION_FILE=tests/locationConfig/locationConfigLegacy.json S3BACKEND=mem mocha --reporter mocha-multi-reporters --reporter-options configFile=$INIT_CWD/tests/reporter-config.json --recursive tests/unit --exit",
     "test_utapi_v2": "mocha --reporter mocha-multi-reporters --reporter-options configFile=$INIT_CWD/tests/reporter-config.json --recursive tests/utapi --exit",
     "test_sur": "mocha --reporter mocha-multi-reporters --reporter-options configFile=$INIT_CWD/tests/reporter-config.json --recursive tests/sur --exit",
-    "multiple_backend_test": "CI=true S3BACKEND=mem S3METADATA=mem S3DATA=multiple mocha --reporter mocha-multi-reporters --reporter-options configFile=$INIT_CWD/tests/reporter-config.json -t 20000 --recursive tests/multipleBackend/objectPutCopyPart.js --exit",
+    "multiple_backend_test": "CI=true S3BACKEND=mem S3METADATA=mem S3DATA=multiple mocha --reporter mocha-multi-reporters --reporter-options configFile=$INIT_CWD/tests/reporter-config.json -t 20000 --recursive tests/multipleBackend/ --exit",
     "cover": "nyc --clean --silent yarn run",
     "postcover": "nyc report --report-dir ./coverage/test --reporter=lcov"
   }