Corrected the format for VM experiment flag
Corrected the format for VM experiment flag

Done the changes as explained and completed the assigned task  by Correcting the format for VM experiment flag

 #41676

Closes https://github.com/dart-lang/sdk/pull/43874
https://github.com/dart-lang/sdk/pull/43874

GitOrigin-RevId: 8bc9d44a22b028d2790b5e8001cd44f45dff1a9d
Change-Id: I8154257f750815d8f8c9760457b51be449e10b45
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/168700
Reviewed-by: Michael Thomsen <5977a55c75bb4612004451a56b0b4c22d9d3311d@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk