tools: disable legacy indentation linting in tools

The tools directory has newer and stricter indentation enabled, but the
legacy indentation rules were not disabled. This could potentitally
result in a conflict between the two rule sets. Disable legacy linting.

PR-URL: #13895
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Roman Reiss <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Refael Ackermann <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>

Author: Trott

tools/.eslintrc.yaml

@@ -10,3 +10,4 @@ rules:
                   MemberExpression: off,
                   ObjectExpression: first,
                   SwitchCase: 1}]
+  indent-legacy: 0