ChildProcess: fix false positives in windowsCreateProcessSupportsExtension

Previously, the implementation would essentially check `startsWith` instead of `eql` (e.g. it would return true for `.exec` because it erroneously 'matched' `.exe`).

Follow up to #13993
aadd1b252eRyan Liptak committed on 1/1/2023, 1:51:56 AM· committed by Andrew Kelleyparent58c1d98
1 file changedLine totals unavailable