Fix CWD in build.sh

Author: PlatCore

graft/subnet-evm/scripts/build.sh

@@ -25,6 +25,7 @@ fi
 # shellcheck disable=SC2154
 echo "Building Subnet EVM @ GitCommit: $git_commit at $BINARY_PATH"
 # shellcheck disable=SC2154
+cd "$SUBNET_EVM_PATH"
 go build -ldflags "-X github.com/ava-labs/avalanchego/version.GitCommit=$git_commit $static_ld_flags" -o "$BINARY_PATH" "plugin/"*.go
 
 # Symlink to both global and local plugin directories to simplify