Add default TEST_SUITES to run-tests.sh

Author: NoahStapp

.evergreen/scripts/run-tests.sh

@@ -49,7 +49,7 @@ GREEN_FRAMEWORK=${GREEN_FRAMEWORK} \
   AUTH=${AUTH} \
   SSL=${SSL} \
   TEST_DATA_LAKE=${TEST_DATA_LAKE:-} \
-  TEST_SUITES=${TEST_SUITES} \
+  TEST_SUITES=${TEST_SUITES:-} \
   MONGODB_API_VERSION=${MONGODB_API_VERSION} \
   SKIP_HATCH=${SKIP_HATCH} \
   bash "${PROJECT_DIRECTORY}"/.evergreen/hatch.sh test:test-eg