Any crate in `contrib/crates.sh` after `fuzz` is ignored

[tcharding]

In

# Build and test for each crate, done with each toolchain.
build_and_test() {
    for crate in "${CRATES[@]}"; do
        local test_vars_script="$REPO_DIR/$crate/contrib/test_vars.sh"

        # Building the fuzz crate is more-or-less just a sanity check.
        if [ "$crate" = "fuzz" ]; then
            pushd "$REPO_DIR/$crate" > /dev/null
            cargo --locked build
            popd > /dev/null
            break
        fi

The break should be a continue otherwise any directory after fuzz is ignored.

[apoelstra]

Why are we special-casing fuzz anyway? Why not just run cargo test in there like normal?