tests: fix command name in test-blackbox.t to be bytes
This command is only used when tests are run with --with-chg, so this was missed
before.
Differential Revision: https://phab.mercurial-scm.org/D7553
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: ForIndentation
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2