try modifying ligthwalletd-update-sync test variables

.github/workflows/sub-ci-integration-tests-gcp.yml

@@ -351,7 +351,7 @@ jobs:
       app_name: lightwalletd
       test_id: lwd-update-sync
       test_description: Test lightwalletd update sync with both states
-      test_variables: "-e NETWORK=${{ inputs.network || vars.ZCASH_NETWORK }} -e TEST_LWD_UPDATE_SYNC=1 -e ZEBRA_TEST_LIGHTWALLETD=1 -e ZEBRA_FORCE_USE_COLOR=1 -e ZEBRA_CACHED_STATE_DIR=/var/cache/zebrad-cache -e LIGHTWALLETD_DATA_DIR=/var/cache/lwd-cache"
+      test_variables: "-e NETWORK=${{ inputs.network || vars.ZCASH_NETWORK }} -e TEST_LWD_UPDATE_SYNC=1 -e ZEBRA_FORCE_USE_COLOR=1 -e ZEBRA_CACHED_STATE_DIR=/var/cache/zebrad-cache -e LIGHTWALLETD_DATA_DIR=/var/cache/lwd-cache"
       needs_zebra_state: true
       needs_lwd_state: true
       saves_to_disk: true