t8*: adjust the references to the default branch name "main"

[git] / t / chainlint / command-substitution.test

(
        foo &&
# LINT: closing ")" of $(...) not misinterpreted as subshell-closing ")"
        bar=$(gobble) &&
        baz
) &&
(
# LINT: missing "&&" on $(...)
        bar=$(gobble blocks)
        baz
)