[E2E - nitro-testnode] remote testnode branch issue

[davebryson]

Using tagged version v0.2.0-rc.0. The nitro-testnode.sh script is failing with the following error:

fatal: Remote branch v3-support not found in upstream origin
./nitro-testnode.sh: line 50: cd: ./nitro-testnode: No such file or directory

[davebryson]

The v3-support branch referenced in the script was recently deleted.

Changing line 49 to: git clone -b release --recurse-submodules https://github.com/OffchainLabs/nitro-testnode.git and commenting out line 52 seems to work.

[bidzyyys]

It has been already fixed in v0.2.0 and merged back to main.