Revert testing changes

Author: TucksonDev

.github/workflows/build-test.yml

@@ -137,7 +137,6 @@ jobs:
       - uses: OffchainLabs/actions/run-nitro-test-node@main
         with:
           no-token-bridge: true
-          nitro-testnode-ref: improve-bold-config
 
       - name: Install Foundry
         uses: foundry-rs/foundry-toolchain@v1
@@ -201,7 +200,6 @@ jobs:
       - uses: OffchainLabs/actions/run-nitro-test-node@main
         with:
           no-token-bridge: true
-          nitro-testnode-ref: improve-bold-config
 
       - name: Install Foundry
         uses: foundry-rs/foundry-toolchain@v1