Don't invalidate connection files on Network Errors
Don't invalidate connection files on Network Errors

Summary:
On iOS devices (internal only right now), when flipper desktop isn't running we get a Network Error instead of a Port not open error, because we can always connect to the port forwarding server running on the phone.
So in this case, don't count this error as a failure so we don't needlessly delete the certificates to attempt to fix it.

Reviewed By: passy

Differential Revision: D13358147

fbshipit-source-id: 8f9fb62cd2dcada058d104ef60f788a1b62d7094

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